Eazypower hinge centering drill bits. Comes in 4 pack. Drill bits included #6 (3/32), #8 (7/64). #10 (1/8), #12 (5/32). Drills Perfect centered holes fro hinges, hooks and other hardware. Spring loaded with hex key to adjust drilling depthDrills a perfectly centered hole every timeSix torque settings, variable speed/reversing with electronic brake and soft gripGreat for installing hinges, brackets, towel bars, cabinet hardware, drapery rods, window shades and blinds