Warrior Self-Centering Doweling Jig (Item 59789)

Clamps directly to the workpiece for precise right-angle drilling, drills 1/4", 5/16", 3/8", 7/16", 1/2" dowel holes, centers on boards up to 2-3/4" thick, extruded aluminum frame with hardened steel bushings.

Strong independent review base (213 reviews, 4.5 stars). Caution: don't overtighten or it can throw the jig out of center — light, even tightening works best.