This Irwin record 8-inch mechanics vise has replaceable hardened steel jaws along with a fused-steel handle that bends before the vise can be overstressed for added safety.
The Vise-Grip® has a machined-steel mainscrew with rolled 2-start acme thread for wear-resistance and smooth operation.
Irwin Vise-Grip® is fully machined on all work surfaces.
An internal sg nut takes load and secures and aligns the mainscrew.
A safety stop prevents the slide from accidentally separating from the body.