A power tool system comprising a power tool handle (100) comprising: i. a handle comprising a grip portion (112); ii. a drive shaft (150) journalled for rotation within the handle; iii. a motor (102) housed within the handle, the motor driving the drive shaft; iv. a trigger (113) disposed proximate the grip portion for actuating the motor; and v. a button (137) 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 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 (150) to the tool output, the main opening defining a central axis; iv. a pin 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 (137) is in the first position, wherein when the button is in the first position the trigger can actuate the motor, 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.