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 Hex shank size: 6.35 mm/(1/4") The total length: 50mm / 1.97inch Bit size: T10 Weight: 89g Package Included: 10 x Screwdriver Bits 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