IRWIN Tools VISE-GRIP Original Locking Clamp, 8-Piece Set (8107ZR) Versatile wide-opening jaws clamp a variety of shapes. Guarded trigger provides quick release while helping prevent accidental release. Locking clamps are constructed of high-grade heat-treated alloy steel for maximum toughness and durability. Adjust pressure and work fit with turn screw that stays adjusted for repetitive use. Includes 2 6R, 2 11R, 2 18R and 2 24R locking clamps. Backed by the IRWIN lifetime guarantee.