Description It is made from premium chrome-vanadium steel, which greatly improves the strength and abrasion resistance of the workpiece. The extra electroplating process provides products with higher rust-resistance and better gloss. Hex shaft fits all quick-change adapters, extensions and drill chuck. Features - Color: Black. - Size: 5.80X1.50X1.50cm/2.28X0.59X0.59 inch. - Material: Chrome-vanadium steel. - It is made from heat-treated hardened chrome-vanadium steel. - Durable solid steel set designed to withstand torque compression under most standard use situations. - The electroplating process of the adapter surface makes the power drill socket adapter set anti-rust. - Used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hexagonal tool. - Great for DIY, automotive repair, household maintenance, and most general repair, suitable for mechanics hobbyists and DIY lovers. It is made from heat-treated hardened chrome-vanadium steel. Durable solid steel set designed to withstand torque compression under most standard use situations. The electroplating process of the adapter surface makes the power drill socket adapter set anti-rust. Used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hexagonal tool. Great for DIY, automotive repair, household maintenance, and most general repair, suitable for mechanics hobbyists and DIY lovers.