Drive Bits are Made of High-Duty S2 Steel Material. The Overall Heat treatment, High Hardness, Torque and Strong Wear.Hardness Upto HRC58-62. || Double Head Application, Phillips PH2 Head on Both Ends. || Each Bit is a precision tip for ideal fit in Screw Head Recesses, Resulting in Less Stripped Screws. || Designed to work with most powered corded or cordless driver, and reduces slipping in standard chucks. || Impact-Grade Corrosion-Resistant Drive Bit is designed for Impact driver, and keeps corrosion and provide durability against heavy duty environments. || Angular, Smooth and No Burr. Accurate Size and Non-Vulnerable Angle. || Suitable for Various Pneumatic Bits. Best for Furniture Assembly, Hinge Installation. Length: 65MM. Set of 10 Pcs