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 OD Capacity 100mm 4in Chain Length 390mm 1534in Weight 08kg Rated Pipe Capacity is the nominal diameter that can be correctly tightened Actual OD Capacity is the actual OD that chain can accommodate