For routing solid wood serving trays, Flat dishes, shallow bowls, and similar objects, use This 3-in-1 specialty plunging bit. It cuts Flat, smooth bottom surfaces, vertical walls, and a transition radius between them, all in one pass. Has a shank-mounted bearing so the bit can be used with a template or pattern, #45983, diameter (D) 1/2, radius (r) 1/8, cutting Height (B) 1/2, shank (D) 1/4, overall length (L) 2-1/8, replacement collar 47724, replacement bearing 47701, flutes 2, Carbide Tipped bowl & Tray 1/8 radius x 1/2 dia x 1/2 x 1/4 inch Shank with upper Bb