VISE-GRIP Locking WrenchHeavy duty jaws lock on to three sides of a hex fastener and will not slip or mar. Designed to replace up to 16 wrench sizes. Includes a built-in wire cutter. 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. Jaw Opening: 7/16 in [Min], 3/4 in [Max]; Jaw Shape: Hex Jaw; Material: Alloy Steel; Mechanism: Adjustable Mechanical Locking; Overall Length: 7 in; Packing Type: Carded; Weight: 0.95 lb.