Materials: This deep impact socket kit is made of chrome molybdenum steel with the heat treatment. And the sleeve is made of nylon to help it resist corrosion Design: The plastic insert inside the sleeve protects the front side of the aluminum wheel nuts. And with the size printed on the body, this drive socket set provides you with clear identification and convenient use Function: This deep impact socket set can be used on all tools/wrenches. pneumatic and battery-powered shocks, as well as breaker bars, strong wrenches and torque wrenches. Suitable for impact use, ideal for garage use Application: This deep socket set fits any 1/2" ratchet bar / bar. And it includes metric sizes: 17mm , 19mm and 21mm Storage: All the tools are well organized in the plastic storage box for your easy transport and storage s: This impact socket kit offers you easy and clear identification of different color. . Specifications: Material: Material CR-V Handle method: nylon to prevent wheel damage Function: For air tools and impact guns Size optional : 17, 19, 21mm Colour: yellow, blue, red Package included: 1 x socket set deep impact (3 pieces)