Rockler Template-Routing Compression Router Bit, Top and Bottom Bearings, 3/4''D x 1-1/2''H x 1/2'' ShankWith cutting flutes that spiral in opposite directions, these solid carbide flush trim compression bits combine upcut and downcut geometries that reduce tearout and chipping on both faces of the workpiece, for superior cutting quality. They're ideal for splintery or chip prone materials such as veneered plywood or melamine. Top and bottom bearings allow templates to be mounted above or below the workpiece, for added convenience.