The IRWIN VISE-GRIP Original Locking C-Clamp features 4"-wide opening jaws for more versatility and the ability to clamp a variety of shapes with just one tool. Pressure and fit can be adjusted with the turn screw that stays adjusted for repetitive use. Constructed of high-grade, heat-treated alloy steel for maximum toughness and durability, the Original C-Clamp has the classic trigger release design that maintains maximum locking force where you need it. Backed by the IRWIN Lifetime Guarantee.