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C-clamps or G-clamps are typically made of steel or cast iron, though smaller clamps may be made of pot metal. At the top of the "C," is usually a small flat edge. At the bottom is a threaded hole through which a large threaded screw protrudes.C-Clamps or sometimes referred to as G-Clamps, are used to hold materials in place, usually wood or metalC-Clamps have been used in wood working for quite awhile, they help hold pieces steady.