Features: * brand new and high quality. *It is suitable for pneumatic screwdriver and ordinary hand electric drill. It is mainly used for installing and disassembling hexagonal head screw and hexagonal head nut. *It is made of high quality chrome vanadium steel, hardened by high temperature heat treatment, hardness above HRC60, not easy to be deformed and worn, and durable. *With a strong core, it can absorb screws for easy removal and installation of hex head screws and nuts. *The hex shank design increases the clamping force and is widely used. Specifications: Material:chrome vanadium steel Colour:metallic Hardness:HRC60 Total length: 80mm Diameter:5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm ,13mm,14mm,15mm,16mm,17mm,18mm,19mm（optional） Package Contents: 1*Hex Sockets Made of high quality material, durable and practical to use. Perfect functions,give you a wonderful experience. We will ship it ASAP,when you place the order. If you have any questions, please feel free to contact us, we will solve it for you. Every customer can enjoy 30 days refund or replacement for Damaged/Quality Issues.