Made of high quality alloy steel (chrome-molybdenum) Tested to the highest specifications to deliver outstanding performance at the competitive cost Set contains 7 of the most popular sizes Packaged in a molded storage case Lifetime Warranty Grey Pneumatic sockets are designed for professional tool users. They are engineered specifically for use with impact tools using the most up to date industrial specifications.This features our "high torque" drive. This limits the amount of wear on the corners of the fastener and the socket. It also improves the strength of the socket, transfers increased torque to the fastener and allows easier access to tight areas. This set contains the following sizes: Deep: 1", Thin Wall Deep: 1-1/16", 1-1/18", and 1-1/4", Metric Deep Length Heavy-Duty: 33mm, Deep Length Budd 1-1/2" and Standard square 13-/16".