This is a nice antique 1.75" capacity C-Clamp pair with the cast steel design, marked "B & C MALLETABLE IRON" on the frame. They both are in very good useable condition with no rust, straight, not bent, good threaded rod. This type of C-Clamp is made of top quality steel and is heavy duty, so these could be used in metal working.  The steel has some sign of nickel or nickel plating, not rust, not bent, nice pair.