Pony 2650 Classic C-Clamp, 1300lb Clamping, 5 inch Max Opening Size, 3-1/4 inch D Throat. The smoothly cut, acme‑threaded steel screw is zinc plated and protected with a black finish for lasting durability. And the clamp casting is made with ductile iron for strength before receiving a powder‑coated Pony‑orange finish.