TIMBERLINE by Amana 210-22 TIMBERLINE PLUNGE ROUND 1/2 Radius2 Flute Thisbit creates a flat-bottom groove between two quarter-round shapes.Short vertical walls extending below the radius lend extra depth to theappearance. Depending upon the cut depth adjustment, the radii can beflush with the work surface or recessed. The profile can be formed onan edge using an edge guide or, on the router table using a fence.