What is a bar clamp?

• A. Designed for spanning wide work, it has a metal bar with screw clamps and an adjustable stop.
• B. A small hammer used for jewelry.
• C. A punch used to mark holes.
• D. A ruler with sliding scale.

Answer: (A)

A bar clamp is an adjustable holding tool used to clamp wide or long workpieces along a sturdy bar. It works by having a fixed jaw at one end of a metal bar and a sliding jaw that moves along the bar, tightened by a screw mechanism to apply steady pressure. The adjustable stop lets you set and repeat the same opening, which is handy when you need multiple clamps at the same width. This design lets you span across wide pieces and keep them aligned during glue-ups, assemblies, or when securing parts for machining. The other described tools—the small hammer for jewelry, a punch for marking holes, and a ruler with a sliding scale—serve different purposes and aren’t clamps.