Which tool helps drill holes with precise centering for dowel joints?

• A. Dowell Drilling Jig
• B. Corner Clamp
• C. Protractor
• D. Calipers

Answer: (A)

For strong dowel joints, holes must be drilled exactly at the intended centers. A dowel drilling jig is designed to make that happen by guiding the drill bit through fixed bushings or sleeves that locate the hole precisely at the chosen center and spacing. It clamps to the workpiece, keeps the drill axis perpendicular to the surface, and ensures the holes in mating pieces line up when you assemble the joint. This consistency is what yields a tight, aligned, and repeatable joint. The other tools don’t provide that guided alignment: a corner clamp holds pieces at 90 degrees but doesn’t steer the drill; a protractor measures angles but doesn’t guide hole placement; calipers measure dimensions but don’t control where holes are drilled.