This is a rare, and hard to find C-Clamp, marked "SHALER" on the thumb screw and frame, and "5 MINUTE VULCANIZER" on the frame in raised cast lettering. The frame has a 2.5" diameter cast on it, and the thumb screw has a + shaped clamp head on it, that has a near knife edge on each of the 4 points, and the points will close against the flat surface of the frame diameter. The clamp can handle about a 3/4" thickness of material. We believe that the vulcanization process was used on rubber, along with some sort of a chemical, or glue, that would cause 2 or more pieces to be attached to one another, but it is not clear how this clamp assisted in the process. The clamp is well made, and sturdy, it's also in good condition, no rust, clean, some minor pitting noted, mostly on the thumb screw head, the threads are in very good working condition. Where do you find another one?
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