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.

The heavy-duty models have replaceable alloy steel jaws.

The light-duty model has a one-piece forged alloy steel handle and jaw. 

RIDGID C-12 Light-Duty Chain Wrench

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.