Bar clamp
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A Bar clamp is a clamp, typically used for woodworking, that consists of a bar or rod with two jaws. Typical construction has one jaw fixed, the other moveable with a screw type clamping mechanism. Bar clamps in the industry terminology have the jaws mounted on a flat bar, while a pipe clamp, which has the same construction, is mounted on a pipe, normally of 1/2" or 3/4" diameter.