Constructed of high-grade heat-treated alloy steel for maximum toughness and durability .Irwin Vise-Grip 586-74 5 Pc Vise-Grip Clampingset Stays adjusted for repetitive use .Hardened teeth are designed to grip from any angle Ideal for tightening, clamping, twisting and turning .Guarded release trigger quickly unlocks and protects from accidental release .