IRWIN Vise-Grip 18DR locking C-Clamp has an exceptionally large throat width of 190mm (7.1/2in), which allows objects up to 10in wide to be gripped, depending on the jaw opening. Locking C-Clamps reach into places where ordinary clamps cannot be used. Fitted with regular tips they are ideal for car body work, welding and sheet metal work. Hex key adjusting screw that tightens to draw materials closer together and also provides controlled release. Specification Length: 455mm (18in). Throat Depth: 250mm (10in). Capacity: 190mm (7.1/2in).