A power tool system comprising: A. a power tool handle comprising: i. a handle comprising a grip portion; ii. a drive shaft journalled for rotation within the handle; iii. a motor (102; 253) housed within the handle, the motor (102; 253) driving the drive shaft; iv. a trigger disposed proximate the grip portion for actuating the motor (102; 253); and v. a button disposed on the power tool handle and movable to a first position and a second position, wherein the button is biased to the second position; and B. a power tool head (104;106;108;110) comprising: i. an output for performing an operation on a work piece; ii. a housing having an inner surface defining a main cavity for receiving the power tool handle, the housing having an outer surface generally opposite the inner surface; iii. a first opening disposed within the main cavity for selectively receiving the drive shaft for transferring the rotation of the drive shaft to the tool output, the main opening defining a central axis; iv. a plurality of pins extending substantially parallel to the central axis for depressing the button, and wherein the power tool head may be removably connected to the power tool handle, wherein when the tool head is coupled to the power tool handle the button is in the first position, wherein when the button is in the first position the trigger can actuate the motor (102; 253), wherein when the tool head is removed from the power tool handle the button is in the second position, and wherein in the second position the trigger is inhibited from actuating the motor (102; 253); wherein the plurality of pins are evenly spaced circumferentially about the central axis and preferably wherein the plurality of pins comprises four pins. A. a power tool handle comprising: i. a handle comprising a grip portion; ii. a drive shaft journalled for rotation within the handle; iii. a motor (102; 253) housed within the handle, the motor (102; 253) driving the drive shaft; iv. a trigger disposed proximate the grip portion for actuating the motor (102; 253); and v. a button disposed on the power tool handle and movable to a first position and a second position, wherein the button is biased to the second position; and i. a handle comprising a grip portion; ii. a drive shaft journalled for rotation within the handle; iii. a motor (102; 253) housed within the handle, the motor (102; 253) driving the drive shaft; iv. a trigger disposed proximate the grip portion for actuating the motor (102; 253); and v. a button disposed on the power tool handle and movable to a first position and a second position, wherein the button is biased to the second position; and B. a power tool head (104;106;108;110) comprising: i. an output for performing an operation on a work piece; ii. a housing having an inner surface defining a main cavity for receiving the power tool handle, the housing having an outer surface generally opposite the inner surface; iii. a first opening disposed within the main cavity for selectively receiving the drive shaft for transferring the rotation of the drive shaft to the tool output, the main opening defining a central axis; iv. a plurality of pins extending substantially parallel to the central axis for depressing the button, and i. an output for performing an operation on a work piece; ii. a housing having an inner surface defining a main cavity for receiving the power tool handle, the housing having an outer surface generally opposite the inner surface; iii. a first opening disposed within the main cavity for selectively receiving the drive shaft for transferring the rotation of the drive shaft to the tool output, the main opening defining a central axis; iv. a plurality of pins extending substantially parallel to the central axis for depressing the button, and