424007 is a part of the CK Tool line, which offers a wide range of hand tools, power tools, and accessories, designed for professionals and DIYers alike. The 424007 is a 3/8" drive impact socket set with the following pieces: 7 metric sockets (10, 11, 12, 13, 14, 15 and 17mm); 5 sae sockets (3/8, 7/16, 1/2, 9/16 and 5/8); and a uni-bit socket. The impact socket set is made from heat-treated chrome vanadium steel and features a black phosphate finish to provide extra protection against corrosion.