TIMBERLINE by Amana 160-70 TIMBERLINE CORE BOX UPPER Ball Bearing2 Flute with Upper Ball Bearing Guide Designedfor cuts guided by a template or pattern. The shank-mountedball-bearing pilot rides along the template edge, and the cutterduplicates the template contour in the workpiece. With a handheldrouter, the template must be on top of the workpiece. With atable-mounted router, the template must be on bottom of the workpiece.