Features:* It is made of high quality chrome vanadium steel, quenched by high temperature heat treatment, hardness above HRC60, it is not easy to be deformed and worn, and durable.* With strong magnetic core, it can absorb the screws for easy disassembly and installation of hexagon bolt and nuts.* The hex chuck increases the clamping force and is widely used. Specifications: Material: Chrome Vanadium Stainless Steel Color: MetallicHardness: HRC60Total Length: 80mmDiameter: 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm ,13mmQuantity: 8 PiecesSuitable for pneumatic screwdriver and ordinary hand electric drill. It is mainly used for mounting and disassembling hex head bolt and hex head nut. Package Contents:8pcs*Hex SocketsNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.