Features: It is made of S2 alloy steel material, overall heating treatment, hardness of ± HRC58, high torque and good toughness, sturdy and durable. The surface is processed by special blue treatment, good-looking, and not easy to rust. Surface printed with specifications, easy to choose the one you need. The magnetic head of the bit is convenient to use and not slip. Wide application range, fit most electric screwdrivers, drills or other power tool. Specifications: Material: S2 alloy steel Bit head diameter: 5mm / 0.20inch Shank diameter: 6.3mm / 0.25inch Length: 150mm / 5.91 inch Weight: 349g Package included: 10 x Hex Head Screwdriver Bit 1、It is made of S2 alloy steel material, overall heating treatment, hardness of ± HRC58, high torque and good toughness, sturdy and durable 2、The surface is processed by special blue treatment, good-looking, and not easy to rust 3、Surface printed with specifications, easy to choose the one you need 4、The magnetic head of the bit is convenient to use and not slip 5、Wide application range, fit most electric screwdrivers, drills or other power tool