A bar clamp is a type of clamp with a long, straight bar that serves as the base for holding materials. It has two arms, one fixed and one adjustable, with a screw mechanism to tighten or loosen the clamp. The adjustable arm slides along the bar to change the width, and the screw tightens to secure the material in place. Bar clamps are often used in woodworking and construction to hold pieces of wood, metal, or other materials firmly while they are being worked on or glued.

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