Irwin's 11" VISE-GRIP Locking C-Clamp is constructed of high-grade heat-treated alloy steel for maximum toughness and durability. It features a guarded release trigger that quickly unlocks and protects from accidental release and a turn screw that adjusts pressure and stays adjusted for repetitive use without damaging the work surface. | Irwin 11" VISE-GRIP Locking C-Clamp with Swivel Pads