MK Morse TAC38 Real McCoy Bi-Metal Hole Saw with 2-3/8-Inch Diameter The item is MK Morse TAC38 Real McCoy Bi-Metal Hole Saw with 2-3/8-Inch Diameter Used for Power Tool Accessories, Hole Saws The product is manufactured in United States Attached 7/16 inch pass through shank arbor is convenient and time saving Variable pitch positive rake teeth reduce vibration and clear chips to improve cutting speed M3 cutting edge teeth are shock resistant and longer lasting