Irwin "The Original" Vise Grip 18" Locking C-Clamp with Regular Tips & 8" Jaw Capacity. The wide-opening jaws provide greater versatility in clamping a variety of shapes. The clamp is constructed of high-grade heat-treated alloy steel for maximum durable toughness & has a turn screw to adjust pressure & fit work, stays adjusted for repetitive use. Classic trigger release designed to provide maximum locking force. Model 18R. Item No. 21.