IRWIN Record Stillson Wrenches are standard equipment in a wide range of major industries. They have drop forged handles and jaws, with high grade cast malleable iron frames. Accurately machined screw threads and nut with sprung jaw which stays open until pressure is applied. Conforms to BS 3594 Part 1.IRWIN Record 300 Stillson Wrench 450mm (18 in). Length: 450mm (18 in).Pipe capacity Nom Bore: 51mm (2 in).