Locking mechanism guarantees no slippage. Jaws open wide for versatility.C Clamp With Regular Tips measures 6 inches with a jaw adjustment of up to 2 inches and a throat depth of 1-1/2 inches easily adjusts to correct opening locks with one hand and made of high-grade alloy steel heat treated for maximum toughness and durability. Irwin tools are made of only the finest materials manufactured to exacting tolerances.