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Clamp (tool) For other uses, see Clamp. A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
The C clamp is useful for clamping wood or metal; the handscrew is used for clamping wood objects at an angle; spring clamps provide light clamping pressure when gluing; bar and pipe clamps hold larger components in place; and web clamps tighten around large materials with a softer nylon webbing.