The RIDGID Chain Wrenches has a sturdy, cast-iron housing with an I-beam handle and a double jaw that gives fast, ratchet-like action in either direction. It is ideal for use in close quarters. This light-duty model has a one-piece forged alloy steel handle and jaw. Size 300mm (12in). Rated Pipe Capacity 50mm (2in). Actual O.D. Capacity 100mm (4in). Chain Length 390mm (15.3/4in). Weight 0.8kg. Rated Pipe Capacity is the nominal diameter that can be correctly tightened. Actual O.D. Capacity is the actual O.D. that chain can accommodate.