Features: These bits are made of S2 Steel material, large moment of force and high toughness. The surface is processed by special blue treatment, not easy to rust. The magnetic head of the bit is convenient to use and not slip. With 6.3mm(1/4inch) hex shank, they are widely used on air screwdrivers, electric drills, etc. The type of the bit is printed on the surface, easy to choose the one you need. Specification: Material: S2 steel Hex Shank: 6.3mm(1/4in) Length: 75mm Size: 4.5mm Type: PH2 Weight: 131g(approx.) Package Includes: 10 x Screwdriver Bits 1、These bits are made of S2 Steel material, large moment of force and high toughness. 2、The surface is processed by special blue treatment, not easy to rust. 3、The magnetic head of the bit is convenient to use and not slip. 4、With 6.3mm(1/4inch) hex shank, they are widely used on air screwdrivers, electric drills, etc. 5、The type of the bit is printed on the surface, easy to choose the one you need.