Description:These screwdriver bits are adopted of S2 quality steel, which is anti-impact and tough, great wear resistant. Magnetic head, so they can fixed on the screw firmly.Features:Exquisite workmanship, each edge can be accurately locked screws, no damage to the screw, and the screwdriver head. Adopted of high quality S2 quality steel, which is anti-impact and tough, great wear resistant. With 1/4" hex shank, they are widely used on electric screwdrivers, hand screwdrivers, electric drills, etc. There are different sizes of screwdriver bit heads, H2.5, H3, H4, H5, H6, H8, H10, H12. So is convenient to you, can meet your varied requirements. A commonly used material in hardware with high hardness, such as electric screwdrivers, hand screwdrivers, electric drills, air drills, etc. Specifications:Materials: S2 alloy steelType of Shank: HexDia. of Shank: 6.35mm (1/4 inch)Length of Screwdriver Bit: 100mmSize of Bit: H2.5, H3, H4, H5, H6, H8, H10, H12Content:1 x 100mm*2.5mm 1 x 100mm*3mm 1 x 100mm*4mm1 x 100mm*5mm1 x 100mm*6mm 1 x 100mm*8mm 1 x 100mm*10mm1 x 100mm*12mmPackage Included: 1 Set x Hex Screwdriver Bit(include 8pcs).