Features 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 Specification 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 Shank diameter: 6.3mm / 0.25inch Bit head: 3mm / 0.12inch Length: 65mm / 2.56inch Weight: 145g Package included: 10 x Screwdriver Bit Package List