C-Clamp - Types of Clamps - 8 Clamps to Help in Any DIY Project - Bob Vila
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One of the most widely used and most versatile clamps, the C-clamp is generally made of steel or cast iron. It comes in a variety of sizes and is operated by turning a threaded rod that closes the "C" when tightened. You can easily overtighten a C-clamp, so take care not to damage softer woods—sandwich your work between blocks of wood, or buffer it with cardboard or felt.