Mechanic's vise designed for heavy-duty use. Hardened steel jaws for extended durability, which can be replaced. Safety stop prevents the sliding jaw from being detached from the body. The knob with an integrated safety feature bends before the vise is over-stressed. The double-threaded cold-rolled trapezoidal screw allows for faster and smoother operation. The body and sliding jaw are made of fine-grained gray cast iron, which has been processed for smooth and reliable operation on all friction surfaces. The guide nut made of unbreakable spheroidal graphite cast iron can be replaced when worn.