Description Grey Pneumatic sockets are designed for professional tool users. Made of high quality alloy steel. Engineered specifically for use with impact tools. Benefits of the GP Impact Socket ?High Torque? drive: Increased strength, easier access to tight areas, and reduced wear. 4-Point 3"8" Drive 5"1"" Square Female Pipe Plug Socket Drive End 0.7"? Square Female Pipe Plug Depth 0.28? Length 0.98"; Lifetime Warranty