Made of high qualityChrome Vanadium Steelmaterial, durable and rustproof, high strengh and long service life. With these durable bit sockets you can fix or detach professional mechanical device more easily. Replaceable design make you can replace the bits when they are damaged orabrasion. Features - Color: Silver. - Material: Vanadium Steel. - Size: About 5 x 1.5 x 0.8cm. - Made by high qualitychrome vanadium steel material, durable and long service life. - Professional designed for machine fix or detach, metal process and industrial use. - Included an simple storage box let you storage it more easily, avoid lost effectively. Also this simple storage box can be use as an professional suit case, let you take it anywhere. Warm Tip: Dear buyer, Due to lighting effect, monitor& 39;s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you