Pony’s heavy‑duty carriage C‑clamps are the most universally used general‑purpose C‑clamps for regular‑duty industrial service. Clamp frames are liberally proportioned and heat treated for maximum strength, and ribbed to resist side strain. Longer frame hubs combined with a copper‑coated screw with special, smoothly cut acme square threads ensure lasting durability. Black‑powder‑coated castings.