Product Description 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.. From the Manufacturer C Clamp With Regular Tips, measures 11 inches, with a jaw adjustment of up to 4 inches, and a throat depth of 2-5/8 inches, easily adjusts to correct opening, locks with one hand, and made of high-grade alloy steel heat treated for maximum toughness and durability. Irwin tools are made of only the finest materials, manufactured to exacting tolerances.