Pro-Grade 13251 3/8-Inch Drive with 5/8-Inch Universal Spark Plug Socket Forged from chrome vanadium alloy steel, nickel-chrome plated for corrosion resistance and durability Designed with chamfered and recessed leading edges to provide the most positive fit possible All sockets feature the Dyna-Drive Torque System which allows the application up to 20% more driving torque, with no slippage or fastener damage Limited Lifetime Warranty