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. Set contains the following 6 point sizes: Thin Wall Deep: 1-1/16", 1-1/8", 1-1/4"; Fractional Deep: 1", 1-3/16", 1-1/2", 1-3/4";Metric Deep 33mm and 4-point Fractional Standard Square: 13/16" and 15/16".