IRWIN VISE-GRIP Original Locking C-Clamp, 18", 211ZR 7-1/2"-wide jaw opening capacity provides versatility in clamping a variety of shapes Turn screw to adjust pressure and fit work Stays adjusted for repetitive use Constructed of high-grade heat-treated alloy steel for maximum toughness and durability Classic trigger release designed to provide maximum locking force 7-1/2"-wide jaw opening capacity provides versatility in clamping a variety of shapes Stays adjusted for repetitive use Constructed of high-grade heat-treated alloy steel for maximum toughness and durability Classic trigger release designed to provide maximum locking force