The Strong Hand Improved PR6 Locking C-Clamp is strong and durable, made with heat-treated steel and nickel-chrome plating. This C-Clamp is 6.5 inches long with a 1 ¾-inch throat depth and a 2 ¼-inch jaw opening. It fits well in any professional metal working environment. This clamp has rugged, rounded tips and a deeper than usual throat, making it more versatile and with the strength of treated steel. It is the strongest and easiest pair of clamping pliers to use.