Materials: This deep impact socket set is made of heat-treated chrome molybdenum steel. The sleeve is made of nylon for corrosion resistance. Design: The plastic insert inside the socket protects the front face of aluminum wheel nuts. The size markings printed on the body of this drive socket set provide clear identification and convenient use. Function: This deep impact socket set can be used on all pneumatic and battery-powered impact tools/wrenches, as well as cutter bars, heavy-duty wrenches, and torque wrenches. Suitable for impact use, ideal for garage use. Application: This deep socket set fits any 1/2" ratchet/bar. It includes metric sizes: 17mm, 19mm, and 21mm. Storage: All tools are neatly organized in the plastic storage box for easy transport and storage. Descriptions: This impact socket set offers easy and clear identification by color. Specifications: Material: CR-V material Handle Method: Nylon to prevent wheel damage Function: For pneumatic tools and impact wrenches