Power Tool Insert Bits

Phillips bits have a cross-shaped tip with four points, which fit into the corresponding cross-slot in the Phillips screw

Slotted bits have a flat, single straight edge that fits into the single horizontal groove on slotted screws

Square bits have a square shaped tip with four sides, which fit into the matching square recess in a square-drive screw.

Torx bits have a six-pointed star-shaped tip, which fits into the corresponding star-shaped recess in a Torx screw

Hex bits have a hexagonal (six-sided) shaft that fits into the corresponding hexagonal recess in a hex screw

A double-ended bit has a screwdriver tip on both ends, allowing you to switch between them without removing the bit from the tool. The tips on either end are usually of different types.