This 12-inch large jaw locking pliers can be used for turning, tightening, clamping, and twisting. The heavy-duty jaw grips around work of all shapes. The 3-1/8-inch / 79mm maximum jaw opening makes this Vise-Grip ideal for plumbers, mechanics, welders and others who work with large objects. This Vise-Grip is built tough to last a lifetime. It is made of high-grade alloy steel that is heat treated for maximum toughness and durability. The hardened tooth design grips from any angle. The adjusting screw gives exacting pressure. Turn adjusting screw to fit work and squeeze handle with one hand to lock on with tremendous pressure. It will stay adjusted for repetitive use. The guarded release with trigger helps keep work safe and quickly unlocks. Vise-Grip is the only locking tools people ask for by name. Full lifetime warranty: Each Vise-Grip tool is warranted to be free from defects in material and workmanship for the life of the tool, except for damage caused by abuse, misuse, or alteration.