General Tools 291 Self-Centering Hinge Bit (No. 3 & 4 Screws)Our Self-Centering Hinge Bits are ideal for drilling exact pilot holes in cabinet and door hinges and door buts. The chamfered drill guide centers inside the hingeâs screw hole for a perfect pilot hole and also protects the point during storage. The Hinge Bits have an adjustable collar for decreasing the drill depth.General Tools 291 Self-Centering Hinge Bit (No. 3 & 4 Screws) Features:; Drill Size â 5/64â; Drill Depth â 1/8â; Screw Size - #3 and #4; Makes accurate pilot holes for hinges; Spring-loaded outer guide with chamfered head; Adjustable drill depth.; Self centering hinge bit; Ideal for drilling accurate pilot holes for hinges; Spring loaded guide with chamfered head; Adjustable drill depth; 5/64" drill size
- Spring loaded outer guide keeps the high-speed drill centered
- Maximum drill depth of 1-1/8" for size 3 and size 4 screws
- Self-centering for consistently accurate pilot holes
- Adjustable drill depth
- Perfect for drilling pilot holes in cabinet and door hinges and door butts