Curved jaw puts tremendous pressure on four points of any style nut or bolt head. Ideal for tightening, clamping, twisting and turning. Turn screw to adjust pressure and fit work; stays adjusted for repetitive use. Constructed of high-grade heat treated alloy steel for maximum toughness and durability. Guarded release trigger quickly unlocks and protects from accidental release Hardened teeth are designed to grip from any angle. Jaw capacity: 1-7/8".