Stillson aluminum pipe wrench 18 304-450-2. the aluminum alloy handle is comfortable and has a double t section. resistant and lightweight aluminum structure, 40% lighter and more resistant. high strength aluminum alloy with anti-corrosion treatment special very robust forged jaws for pipes from 1-1/2" to 5". unit packed in cardboard box. standards: american standard ggg-w-651, type i, class b, une 16554."