Descriptions: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:These screwdriver bits are magnetic head, so they can fixed on the screw firmly.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 type screwdriver bit heads, such as: Slotted head, cross head, security star head. So is convenient to you, can meet your varied requirements.Suitable for professional maintenance personnel, computer maintenance, camera maintenance, eyeglasses maintenance, instrument maintenance.Specifications:Material: S2 quality steelHardness: HRC60Hex shank size: 6.35 mm/(1/4")The total length: 100mm/3.94inchSecurity Star: T8, T10, T15, T20Slotted: Dia. 6mm, Dia. 5mm, Dia. 4mmCross(PH2): PH2 Dia. 6mm, PH2 Dia. 5, PH2 Dia. 4.5Head type: Slotted head, cross head, security starWeight: 170gQuantity: 10 PCSPackage Included:10 x Screwdriver Bits