Roundover

A roundover eases a sharp 90-degree corner into a smooth, convex curve, most commonly a simple quarter-circle, cut in a single pass with a roundover router bit sized to the desired radius. It's both a decorative edge treatment and a genuinely practical one -- like a chamfer, a roundover resists chipping and feels far better in the hand than a sharp corner, but the fully curved profile reads as softer and less angular than a chamfer's flat 45-degree facet.

Most roundover bits include a guide bearing that rides the workpiece edge, controlling the cut depth automatically and letting the bit follow curved edges as easily as straight ones.