Ridgid 66987 Model F-45 4 1/2" Forged Vice With Base is constructed of 75,000 psi tensile strength forged Steel. These sleekrugged vises Out perform their bulky cast-iron competition. Ridgid Model F-45 Forged vises feature a patented parallel jaw alignment System. This exclusive feature gives the F-Series precise clamping Actionas well as longer service life. Forged Vise features all Steeldrop-forged constructionrolled double Lead Acme screwSteel Handle With rubber anti-pinch ringsincreased work areasstandard fixed pipe JawsLarge hardened anvilsurface hardened slides for smooth percise operationand forged Steel swivel base With dual draw-down bolts.