IRWIN Record Chain Pipe Vice rests on a V formed by two sets of drop-forged, heat-treated replaceable steel jaws. The high tensile steel chain is then looped over the pipe, locked into a slot between the jaws and tensioned by a handle and screw to provide a strong rigid three-point location which renders the pipe immoveable. Body castings are guaranteed against breakage. IRWIN Record 182C Chain Pipe Vice. Pipe Capacity 6-100mm (1/4-4in).