The RIDGID OOR Cast-Iron and Steel Ratchet Handle Assembly is the go-to tool when excellent thread quality is a must. The threading ratchet is constructed from heavy-duty cast iron and features a steel handle for durability. A convenient easy-to-access ratchet knob on the head of the ratcheting tap indicates forward and reverse. Die heads easily snap in from both sides and lock in place for faster size changes. The ratchet handle assembly offers 1 in. O.D. maximum pipe capacity and 1/8 in. O.D. minimum pipe capacity. It is designed for 1/2 in., 3/4 in. and 1 in. OO-R and OO-RB threading die heads (sold separately).