New: redesigned with permanent bearing Retaining collar to reduce trimming mishaps. This Solid carbide flush trim router bit is designed to provide precise, efficient cuts and offers extreme durability. The spiral design largely reduces chipping. For use with soft & hard woods, ply-woods, composites, laminates, plastics and some non-ferrous metals. The two independent ball bearings at the tip ensure smooth running. 1/4" Shank.