Chrome Molybdenum, drop-forged, deep WallDrive(r) impact socket. Hardened and tempered for added strength, with phosphate finish for greater corrosion resistance. Ideal for use with air impact wrenches. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Chrome Molybdenum, drop-forged, deep WallDrive(r) impact socket. Hardened and tempered for added strength, with a phosphate finish for greater corrosion resistance. Ideal for use with air impact wrenches. Lifetime guarantee*.