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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.
Sometimes clamps are only used to hold a single object down as it is worked on and then removed. For instance, instead of cutting a 2-inch by 4-inch piece of lumber by propping it up on his or her knee (which is extremely dangerous), a person can clamp the lumber to a work table and keep both hands safely on the saw.