Which tool clamps and holds two workpieces at 90 degrees for gluing or fastening?

• A. Corner Clamp
• B. Protractor
• C. Calipers
• D. Ruler

Answer: (A)

Maintaining a right angle between two pieces during glue-up is essential for a sturdy corner joint. A corner clamp is built to grip two pieces at a precise 90-degree angle and apply even pressure while the glue dries or while you drive fasteners. It typically has two arms that meet at the corner with adjustable jaws or a locking mechanism to keep the pieces square as you work, preventing any shifting and allowing a clean, accurate joint. This hands-off stability is exactly what you need when joining pieces at 90 degrees.

A protractor measures angles but doesn’t hold pieces in place. Calipers measure dimensions like thickness or gap distances but don’t provide clamping force. A ruler measures length and likewise doesn’t secure parts. So the corner clamp is the tool designed for gluing or fastening two workpieces at a right angle.