These Erbauer screwdriver bit are made from steel (s2 grade) Erbauer Heavy Duty Mixed Screwdriver Bit Set comes with- 10x pozidriv (2x PZ1, 6x PZ2 and 2x PZ3), 10x phillips (2x PH1, 6x PH2 and 2x PH3), 2x square (SQ1 and SQ2), 2x slotted (5.5mm & 6.5mm), 6x torx (T15, T20, T25, 2x T30 and T40), 1x ¼" socket adapter, quick chuck (65mm) and plastic storage box Geometrically designed precision tip that fits into fasteners more precisely, reducing stripping and cam-out Erbauer Heavy Duty Mixed Screwdriver Bit Set is made from cold-forged high-grade steel that makes this a heavy-duty product, capable to withstand high torque output Highly visible laser-etched markings Bits are built with impact drivers for maximum durability and long life Shank type: Hex; Standard: DIN 3126