POWERTEC 71000 Face Clamp, 6-Inch Extra-large clamp face spreads clamp pressure evenly Locking clamp is constructed of high-grade, heat-treated alloy steel for maximum toughness and durability Clamping the joint helps to prevent mis-alignment when screw follows the grain; Virtually hassle free for screwing joints together 1-3/16-Inch drawing movement Ensures accuracy and safety