The OX Stilson Pipe Wrench is compatible with most pipe wrenches made of various materials like copper, aluminum, ferrous and non-ferrous materials with different sizes and comes with deeply grooved jaws for a good grip and ratcheting action while using the tool. The Pipe Tightener Tool is tough and is forged from high-grade heavy duty steel material. The Plumbing Tool Pipe Wrench is 300 mm / 12 inches in length and its adjustable jaws open upto 40 mm.