Descriptions: It is made of S2 alloy steel material, overall heating treatment, high torque and good toughness, sturdy and durable. Wide application range, fit most electric screwdrivers, drills or other power tool. 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 blue finished, good-looking, and not easy to rust. The contact area is large between the bolt tooth groove and the rotary head, easy to operate, not slippery. Surface printed with socket specifications, easy to choose the one you need. Arc drive square hole design, locking force is stronger. Wide application range ,fit most electric screwdrivers, drills or other power tool. The small size allows you to bring your sockets anywhere and can fit into many tool bag. Specifications: Material: S2 alloy steel Heat treatment: ± HRC58 Type: H4, H5, H6, H7, H8, H10, H12, H14, H17 (Optional) Length: 50mm / 1.97inch Bottom diameter: 22mm / 0.87inch Bottom square hole: 1/2" Weight: Approx. 88~135g Package Included: 1 x Hex Socket Adapter 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 blue finished, good-looking, and not easy to rust 3、The contact area is large between the bolt tooth groove and the rotary head, easy to operate, not slippery 4、Surface printed with socket specifications, easy to choose the one you need 5、The small size allows you to bring your sockets anywhere and can fit into many tool bag