For slotted, Phillips and hexagonal screws. 23-piece tip set: 21 tips, 1 screwdriver and 1 adapter for bit holders. Screwdriver to blow for tips of 5/16 . Adapter for ½ tips for 5/16 hexagonal square. Robust and resistant tips. 5/16 "hexagonal square. DIN 3126, ISO 1173 and C8 style. To loosen bolts or nuts locked without using power tools. High performance steel alloy. In metal box. Robust and resistant tips.