TIMBERLINE by Amana 320-18 TIMBERLINE CORNER ROUND 1/4 Radius D2 Flute with Ball Bearing Guide Thecorner-rounding bit rounds an edge to a given radius. The tool isshouldered to cut a fillet. The cut can be used to ease edges, as asimple profile, or as a part of a complex one. Also known as roundover,rounding over, and quarter-round.