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 . *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: 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 from high-quality materials, our tools products are durable and affordable to meet your daily needs. Please check the product size and model before placing an order to ensure it is the product you need. When you encounter a problem, please contact us and we will help until the problem is perfectly solved. When you receive your product, whether you are satisfied or not, we want to hear your opinion. Every customer can enjoy free refund or exchange service for damaged/quality problem products.