Pro-Grade 11302 3/8-Inch x 7/16-Inch Open End Wrench, 1-Pack Hot drop-forged from chrome vanadium alloy, then heat treated for optimum strength The broad, flat paneled beams are smooth edges, then nickel-chrome plated and polished to a mirror finish All wrenches features the Dyna-Drive Torque System which allows the application of up to 20% more driving torque, with no slippage or fastener damage Limited Lifetime Warranty