Abstract:
A rotary cutting system for releasable connection to a power tool, the power tool including a housing, a motor supported in the housing and a drive mechanism driven by the motor, the rotary cutting system comprising a universal shaft having a first shaft end and a second shaft end positioned opposite the first shaft end, the first shaft end being removably securable to the power tool, and a cutting tool having a first tool end, and a second tool end spaced a distance of at least 3.5 inches from the first tool end and operable to cut a workpiece, the first tool end being removably securable to the second shaft end of the universal shaft.

Description:
RELATED APPLICATIONS 
     The present invention claims the benefit of prior-filed, U.S. provisional patent application Ser. No. 60/956,855, filed Aug. 20, 2007, the entire contents of which is hereby incorporated by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to cutting tools and, more particularly, to a rotary cutting tool for a power tool. 
     SUMMARY 
     In some embodiments, the present invention provides a kit including a cutting tool for use with a power tool for cutting a workpiece. The cutting tool can include a universal shaft and a cutting bit, both of which can have a first end and a second end and define a longitudinal axis extending through the respective first and second ends. The cutting tool can be assembled by connecting the universal shaft and cutting bit, aligning the axes of the universal shaft and the cutting bit, and using a locking assembly to secure the cutting bit to the universal shaft. In some embodiments, the locking assembly can be located on the universal shaft. In other embodiments, the locking assembly can be located on the cutting bit. 
     The present invention also provides a housing for a cutting tool which can include a universal shaft and a cutting bit. The cutting tool can be assembled by connecting the universal shaft to the cutting bit using a locking assembly. The universal shaft and cutting bit can be secured in the housing by a connecting structure, which can be formed around or partially engage the cutting tool and/or the universal shaft. 
     The present invention also provides a rotary cutting system for releasable connection to a power tool, the power tool including a housing, a motor supported in the housing and a drive mechanism driven by the motor. The rotary cutting system comprises a universal shaft having a first shaft end and a second shaft end positioned opposite the first shaft end, the first shaft end being removably securable to the power tool, and a cutting tool having a first tool end, and a second tool end spaced a distance of no more than inches from the first tool end and operable to cut a workpiece, the first tool end being removably securable to the second shaft end of the universal shaft. 
     The present invention also provides a rotary cutting tool kit. The rotary cutting tool kit comprises a universal shaft being removably securable to a power tool, and at least two differently sized cutting tools operable to cut differently sized holes in a workpiece when driven by the power tool, wherein a length of the universal shaft between a first shaft end, which is removably securable to a power tool, and a second shaft end is greater than a length of each of the at least two differently sized cutting tools between cutting edges and first tool ends, each of which is selectively securable to the universal shaft. 
     The present invention also provides a method of configuring a rotary cutting tool to cut at least two differently sized holes. The method comprises operating a power tool including a drive mechanism driven by a motor supported in a housing of the power tool, securing a first shaft end of a universal shaft to the drive mechanism, securing a first cutting tool to a second shaft end of the universal shaft opposite the first shaft end of the universal shaft, the first cutting tool being operable to cut one of the at least two differently sized holes and having a length between a cutting edge and a universal shaft-engaging end of less than a length of the universal shaft between the first and second shaft ends, removing the first cutting tool from the universal shaft, and securing a second cutting tool with a differently sized cutting head to that of the first cutting tool, the second cutting tool being operable to cut another of the at least two differently sized holes. 
     Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view of a cutting tool and a cutting tool kit according to some embodiments of the present invention. 
         FIG. 1A  illustrates a first portion of a cutting tool according to  FIG. 1 . 
         FIG. 1B  illustrates another portion of a cutting tool according to  FIG. 1 . 
         FIG. 2  is a front view of a cutting tool kit according to an alternate embodiment of the present invention. 
         FIG. 3  is a front view of an interior of the cutting tool kit shown in  FIG. 2 . 
         FIG. 4  is another front view of the interior of the cutting tool kit shown in  FIG. 2 . 
         FIG. 5  is a front view of an exterior of the cutting tool kit shown in  FIG. 2 . 
         FIG. 5A  is another front view of an interior of the cutting tool kit shown in  FIG. 2 . 
         FIG. 5B  is another exterior view of the cutting tool kit shown in  FIG. 2 . 
         FIG. 5C  is a front perspective view of the cutting tool kit shown in  FIG. 2 . 
         FIG. 6  is a front view of a cutting tool kit according to another alternate embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” and “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. 
     Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings. 
     In addition, it is to be understood that phraseology and terminology used herein with reference to device or element orientation (such as, for example, terms like “front,” “rear,” “top,” “bottom,” “lower”, “up,” “down,” etc.) are only used to simplify description of the present invention, and do not alone indicate or imply that the device or element referred to must have a particular orientation. The elements of the present invention can be installed and operated in any orientation desired. In addition, terms such as “first”, “second,” and “third” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance. 
       FIG. 1  illustrates a cutting tool kit  10  including a cutting tool  12 , such as, for example, a flat boring bit, for operation with a power tool having a motor (e.g. a drill, a driver drill, a screwdriver, a hammer drill, and the like) and engageable with a chuck. In some embodiments, the cutting tool  12  is operable to cut holes in a workpiece. In other embodiments and as described in greater detail below, the cutting tool  12  can also or alternatively be operable to drive fasteners (e.g., screws and other threaded and unthreaded fasteners) into a workpiece. 
     As shown in  FIG. 1A , the cutting tool  12  includes a universal shaft  14  having a first end  16  and a second end  18 , and a longitudinal axis  20  extending through the first end  16  and the second end  18 . The first end  16  can be engaged with the front end and/or with the chuck of a power tool. In the illustrated embodiment, at least a portion of the universal shaft  14  has a substantially circular cross-sectional shape. In other embodiments, the universal shaft  14  can be of and/or can include portions having other cross-sectional shapes, such as, for example, D-shaped, square, rectangular, triangular, hexagonal, any polygonal other shape, irregular, or the like. The universal shaft  14  can also or alternatively have varying lengths measured from the first end  16  to the second end  18 , and can include telescoping members for adjusting the length of the universal shaft  14  between the first and second ends  16 ,  18 . 
     As shown in  FIG. 1A , the universal shaft  14  can include a locking assembly  28 . In the illustrated embodiment of  FIG. 1 , the locking assembly  28  is located adjacent to the second end  18 . In some embodiments of the present invention, the locking assembly  28  can include an actuator  30  which is movable between locking (not shown) and unlocking positions (shown in  FIG. 1 ). The actuator  30  can include a collar  32  moveable relative to the universal shaft  14  (e.g., rotatable about the longitudinal axis  20 , slidable along the universal shaft  14 , threaded to the shaft  14 , or a combination of such motions) to move a locking element (not shown) (e.g., a cam, a pin, a roller, a ball, a ramp-shaped protrusion, etc.) into locking engagement with a tool  50  supported in the second end  18  of the universal shaft  14 . 
     During operation, the actuator  30  can be moved relative to the universal shaft  14  toward the locking position such that the actuator  30  or a portion of the actuator  30  moves the locking member into locking engagement with the tool  50  supported in the second end  18  of the universal shaft  14 . In some embodiments, the locking assembly  28  can include a biasing member (e.g., a spring or another elastic element) for biasing the actuator  30  toward the locking position, or alternatively, for biasing the locking element toward a position in which the locking element is lockingly engageable with a tool  50  supported in universal shaft  14 . When the actuator  30  is moved toward the unlocking position, the actuator  30  can be operable to move the locking element out of engagement with the tool  50  supported in the second end  18  of the universal shaft  14 , or alternatively, to move out of engagement with the locking member such that the tool  50  can be moved out of the second end  18  of the universal shaft  14 . 
     As illustrated in  FIG. 1B , the cutting tool  12  can include a number of differently configured tools  50 , each of which can have a first end  52 , a second end  54 , and a longitudinal axis  55  extending through the first end  52  and the second end  54 . In the illustrated embodiments, each of the tools  50  have a substantially flat head  56  and a driving shaft  58  located at the first end  52  and engageable with the locking assembly  28  on the universal shaft  14 . The second end  54  of each of the tools  50  can include a locating tip  60  and cutting blades  62 , which can be used to bore into a workpiece. The heads  56  of the tools  50  extend between the tip  60  and the cutting blades  62  and the driving shaft  58 . 
     In the illustrated embodiment of  FIG. 1 , the tools  50  each have a spade-bit configuration for cutting holes of different sizes through a workpiece (e.g., wood, plastic, or other building materials). In other embodiments, one or more of the tools  50  can have a second end  54  shaped as a twist bit, an auger bit, a router bit, and the like for cutting differently shaped holes in a workpiece, or alternatively, for cutting through different workpieces. In still other embodiments, one or more of the tools  50  can have a second end shaped as a fastener driver and engageable with a fastener, such as, for example, a flathead screw, a Philips head screw, a Torx head screw, an Allen head screw, or the like for driving the fastener into a workpiece. 
     In the illustrated embodiment of  FIG. 1 , each tool  50  has a shortened driving shaft  58  such that a number of tools  50  can be packaged together in the kit  10 . In other embodiments, the driving shaft  58  of one or more of the tools  50  can have a different length or a varying length, or alternatively, can have a telescoping construction to provide an adjustable length between first and second ends  52 ,  54 . As shown in Table 1 and  FIG. 1B , the tool  50  can have a number of different widths W and lengths L. Alternatively or in addition, the kit  10  can include a number of differently sized tools  50 , each of which can have a different width W. In some such embodiments, two or more of the different tools  50  can have the same length L. 
     The width W is measured perpendicularly across the head  56  of the tool  50 , from one side to the other. The length L is measured along the longitudinal axis  55  of the tool  50  from the tip  60  to the end of the driving shaft  58  at the first end  52 . For example, an exemplary tool  50  (i.e., the tool  50  identified in Table 1 as “Flat Boring Bit ½×3.5”) has a width W of ½ inch and a length L of 3½ inches. 
     In the embodiment illustrated in  FIG. 1 , the locking assembly  28  is located on the universal shaft  14  to couple the universal shaft  14  to each of the tools  50 . In other embodiments, the locking assembly  28  or a portion of the locking assembly  28  can be located on each of the tools  50  to couple the tools  50  to the universal shaft  14 . Additionally, the locking assembly  28  can include other locking mechanisms, such as, for example, a magnet for securing the tools  50  to the universal shaft  14 . 
     As shown in  FIG. 1 , the cutting tool kit  10  can include a package  80  for housing and/or displaying the universal shaft  14  and the tools  50 . In some embodiments, the package  80  can include a clamshell housing formed around the cutting tool  12  and a connecting structure  82  for supporting the tools  50  and the universal shaft  14  in the package  80 . The cutting tool  12  can be secured to the package  80  by the connecting structure  82 . In the illustrated embodiment, the connecting structure  82  includes a number of sleeves  84  (i.e., a first connecting structure) for securing the tools  50  to the package  80  and a shaft sleeve  85  (i.e., a second connecting structure) for securing the universal shaft  14  to the package  80 . The sleeves  84 ,  85  are sized to receive and removably secure the tools  50  and the universal shaft  14 . In additional embodiments, the cutting tool  12  can be secured or held in the package  80  by other connecting structures  82  such as, for example, straps, magnets, hook and loop fasteners, latching structures, elastic material, snaps, or the like. 
     In some embodiments, such as the embodiment illustrated in  FIG. 1 , the connecting structure  82  in the kit  10  can support one or more cutting tools  12 . In some embodiments, the connecting structure  82  can also be T-shaped, linear, elongated, sized to engage cutting tools  12 , of varying size, organized in a graduated arrangement, or the like, or any combination thereof. 
     During operation, an operator removes the universal shaft  14  and the tool  50  from the package  80  by releasing them from the connecting structure  82 . The operator then assembles the cutting tool  12  by aligning the longitudinal axis  20  of the universal shaft  14  with the longitudinal axis  55  of the tool  50  and moving the actuator  30  from the unlocking position toward the locked position to secure the tool  50  to the universal shaft  14 . The operator then secures the first end  16  of the universal shaft  14  to the chuck of a power tool and positions the assembled cutting tool  12  above the workpiece with the center of the tip  60  located above the intended cutting location. The operator then activates the power tool to rotate the cutting tool  12  about the longitudinal axis  20 . As the cutting tool  12  rotates, the tip  60  drills a locating hole in the workpiece. Continued forward movement of the cutting tool  12  moves the cutting blades  62  into engagement with the workpiece. After use with the power tool is complete, the operator removes the cutting tool  12  from the power tool chuck, or alternatively, removes the tool  50  from the universal shaft  14  so that a different tool  50  can be secured to the universal shaft  14 . 
     The operator disassembles the cutting tool  12  by moving the actuator  30  of the locking assembly  28  toward the unlocking position so that the locking member is moved out of engagement with the tool  50  supported in the second end  18  of the universal shaft  14 . The operator can then remove the tool  50  from the universal shaft  14 . The operator then replaces the tool  50  and the universal shaft  14  in the package  80  by engaging the tool  50  and the universal shaft  14  with the connecting structure  82  for storage. 
       FIGS. 2-5  illustrate an alternate embodiment of a cutting tool kit  110  including a cutting tool  112  according to the present invention. The cutting tool kit  110  and the cutting tool  112  are similar in many ways to the illustrated embodiment of  FIG. 1  described above. Accordingly, with the exception of mutually inconsistent features and elements between the embodiment of  FIGS. 2-5  and the embodiment of  FIG. 1 , reference is hereby made to the description above accompanying the embodiment of  FIG. 1  for a more complete description of the features and elements (and the alternatives to the features and elements) of the embodiment of  FIGS. 2-5 . Features and elements in the embodiment of  FIGS. 2-5  corresponding to features and elements in the embodiment of  FIG. 1  are numbered in the 100 series. 
     In the illustrated embodiment of  FIGS. 2-5 , the cutting tool kit  110  includes a universal shaft  114  and a number of differently sized tools  150  supported in a reusable housing  180  having a connecting structure  182  for securing the universal shaft  114  and the tool  150  in the housing  180 . In the illustrated embodiment, the connecting structure  182  includes a number of sleeves  184  (i.e., a first connecting structure) for securing the tools  150  to the housing  180  and a shaft sleeve  185  (i.e., a second connecting structure) for securing the universal shaft  114  to the housing  180 . The sleeves  184 ,  185  are sized to receive and removably secure the tools  150  and the universal shaft  114 . As shown in  FIGS. 2-5 , the housing  180  can be formed of a supportive board structure covered with a layer of padding and a fabric outer cover. The outer cover can be of two or more colors and can be assembled to provide attractive designs, such as, for example, the hourglass-shaped design shown in  FIGS. 2 and 5 , on the exterior of the housing  180 . In other embodiments, the housing  180  can be constructed with or without a supportive board, using an alternate type of supportive structure, or the like, with or without a layer of padding, using an alternate material for the outer cover, such as, for example, leather, plastic, rubber, or the like, or any combination thereof. In still other embodiments, the outer material of the housing  180  can be of one or more colors and can be assembled to form any alternate design. 
     As in the illustrated embodiment of  FIGS. 2-5 , the housing  180  can include a first panel  186   a , a second panel  186   b , and a spine  186   c  located between the first and second panels  186   a ,  186   b . In some embodiments, the housing  180  can be collapsed into a storage and/or transport configuration such that the first and second panels  186   a ,  186   b  are folded inwardly toward a position in which the first and second panels  186   a ,  186   b  are substantially parallel and are adjacent, as illustrated in  FIG. 5C . The housing  180  can also be moved toward an opened or display configuration, in which the first and second panels  186   a ,  186   b  are spaced apart and are generally coplanar, so that the contents of the housing  180  can be more easily accessed, as illustrated in  FIGS. 5A and 5B . 
     The housing  180  can include a fastener  188  for securely closing the housing  180 . In the illustrated embodiment, the fastener  188  includes a fastening handle  188   a  attached to an elastic or flexible cord  188   b , opposite ends of which can be secured to a first side (i.e., the first panel  186   a ) of the housing  180 . The fastener  188  can also include a pair of spaced apart locking protrusions  188   c  extending outwardly from a second side (i.e., the second panel  186   b ) of the housing  180 . To lock the housing  180  in a closed position, the fastening handle  186   a  is looped around and secured to the locking protrusions  188   c . In other embodiments, the housing  180  can include other fastening structures, such as, for example, snaps, zippers, hook and loop fasteners, elastic material, or the like, or no fastening structures at all. 
     In the illustrated embodiment in  FIGS. 2-5 , the pocket housing  180  can include a storage pouch  192  located on an interior surface of one flap (e.g., the first flap  186   a , as shown in  FIGS. 3 and 5 ) of the housing  180 . As shown in  FIGS. 2-5 , the pouch  192  can include a zipper  193  for closing the pouch  192 . In other embodiments, the pouch  192  can include other or no closures, such as, for example, snaps, hook and loop fasteners, latching structures, elastic fasteners, or the like. In the illustrated embodiment, the pouch  192  is formed of a mesh material to provide visual access to the interior of the pouch  192 , but in other embodiments the pouch  192  can be made of another material, including, but not limited to, opaque, translucent, or transparent cloth, synthetic fabric, rubber, leather, plastic, and the like. 
     The pocket housing  180  can also include a belt clip  194  and a carrying handle  195  secured to respective interior and exterior sides of the spine  186   c  of the housing  180  between the flaps  186   a ,  186   b , as illustrated in the embodiment in  FIGS. 2-5 , for ease of transport. In other embodiments, the pocket housing  180  can include other carrying structures, such as, for example, a hand grip, a strap, a tool belt loop, or the like, or any combination thereof, or no carrying structures at all. 
       FIG. 6  illustrates an alternate embodiment of a cutting tool kit  210  including a cutting tool  212  according to the present invention. The cutting tool kit  210  and the cutting tool  212  are similar in many ways to the illustrated embodiments of  FIGS. 1-5C  described above. Accordingly, with the exception of mutually inconsistent features and elements between the embodiment of  FIG. 6  and the embodiments of  FIGS. 1-5C , reference is hereby made to the description above accompanying the embodiments of  FIGS. 1-5C  for a more complete description of the features and elements (and the alternatives to the features and elements) of the embodiment of  FIG. 6 . Features and elements in the embodiment of  FIG. 6  corresponding to features and elements in the embodiments of  FIGS. 1-5C  are numbered in the 200 series. 
       FIG. 6  illustrates an alternate embodiment of the present invention including a kit  210  and a cutting tool  212  for use with a power tool for cutting a workpiece. The cutting tool  212  can include a universal shaft  214  and a tool  250 , both of which can have a first end  216  and  252  and a second end  218  and  254 , defining a longitudinal axis  220  and  255  extending through the respective first and second ends  216  and  252 ,  218  and  254 , with the driving shaft  258  of the tool  250  being shortened in length L. The cutting tool  212  can be assembled by connecting the universal shaft  214  and tool  250 , aligning the axes  220  and  250  of the universal shaft  258  and the tool  250 , and using a locking assembly  228  to secure the tool  250  to the universal shaft  214 , as described above. 
     The embodiment of  FIG. 6  provides a packaging structure  280  in the form of a display box. The display box  280  can hold one or more cutting tool kits  210 . In some embodiments, the display box  280  can include a holding structure  280   a  and a lid  280   b . As illustrated, the holding structure  280   a  can include a shortened side and an opposite unshortened side, with adjacent sides being sloped between the shortened to unshortened sides. In other embodiments, the display box holding structure  280   a  can be constructed differently. 
     The embodiments described above and illustrated in the figures are presented by way of example only and are not intended as a limitation up on the concepts and principles of the present invention. 
     
       
         
               
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                 W 
                 L 
               
               
                   
                 DESCRIPTION 
                 WIDTH 
                 LENGTH 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 FLAT BORING BIT ½ × 3.5 
                 ½ 
                 3.5 
               
               
                   
                 FLAT BORING BIT ⅝ × 3.5 
                 ⅝ 
                 3.5 
               
               
                   
                 FLAT BORING BIT ¾ × 3.5 
                 ¾ 
                 3.5 
               
               
                   
                 FLAT BORING BIT ⅞ × 3.5 
                 ⅞ 
                 3.5 
               
               
                   
                 FLAT BORING BIT 1 × 3.5 
                 1 
                 3.5 
               
               
                   
                 FLAT BORING BIT 1¼ × 3.5 
                 1¼ 
                 3.5 
               
               
                   
                 FLAT BORING BIT 1½ × 3.5 
                 1½ 
                 3.5 
               
               
                   
                 FLAT BORING BIT ½ × 4 
                 ½ 
                 4 
               
               
                   
                 FLAT BORING BIT ⅝ × 4 
                 ⅝ 
                 4 
               
               
                   
                 FLAT BORING BIT ¾ × 4 
                 ¾ 
                 4 
               
               
                   
                 FLAT BORING BIT ⅞ × 4 
                 ⅞ 
                 4 
               
               
                   
                 FLAT BORING BIT 1 × 4 
                 1 
                 4 
               
               
                   
                 FLAT BORING BIT 1¼ × 4 
                 1¼ 
                 4 
               
               
                   
                 FLAT BORING BIT 1½ × 4 
                 1½ 
                 4 
               
               
                   
                 FLAT BORING BIT ⅜ × 16 
                 ⅜ 
                 16 
               
               
                   
                 FLAT BORING BIT ½ × 16 
                 ½ 
                 16 
               
               
                   
                 FLAT BORING BIT ⅝ × 16 
                 ⅝ 
                 16 
               
               
                   
                 FLAT BORING BIT ¾ × 16 
                 ¾ 
                 16 
               
               
                   
                 FLAT BORING BIT ⅞ × 16 
                 ⅞ 
                 16 
               
               
                   
                 FLAT BORING BIT 1 × 16 
                 1 
                 16 
               
               
                   
                 FLAT BORING BIT 15/16 × 3.5 
                  15/16 
                 3.5 
               
               
                   
                 FLAT BORING BIT 1⅛ × 3.5 
                 1⅛ 
                 3.5 
               
               
                   
                 FLAT BORING BIT ¼ × 6.25 
                 ¼ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 5/16 × 6.25 
                  5/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT ⅜ × 6.25 
                 ⅜ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 7/16 × 6.25 
                  7/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT ½ × 6.25 
                 ½ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 9/16 × 6.25 
                  9/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT ⅝ × 6.25 
                 ⅝ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 11/16 × 6.25 
                  11/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT ¾ × 6.25 
                 ¾ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 13/16 × 6.25 
                  13/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT ⅞ × 6.25 
                 ⅞ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 15/16 × 6.25 
                  15/16 
                 6.25 
               
               
                   
                 FLAT BORING BIT 1 × 6.25 
                 1 
                 6.25 
               
               
                   
                 FLAT BORING BIT 1⅛ × 6.25 
                 1⅛ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 1¼ × 6.25 
                 1¼ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 1⅜ × 6.25 
                 1⅜ 
                 6.25 
               
               
                   
                 FLAT BORING BIT 1½ × 6.25 
                 1½ 
                 6.25