This new quick release jaw is designed for quick opening and closing. The quick release lever disengages the screw so you can position the work with one hand while quickly opening or closing the vise with the other. Adjust the lever again, then the screw engages so you can close or open the vise with the steel handle. Itgives you the ultimate in benchtop performance. Heavy duty design for the toughest applications. Maximum opening and jaw width are 5", throat depth is 3". Steel replaceable pipe jaws, 360degrees swivel base with dual locks, powder coated finish and polished anvil.