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, #45990, diameter (D) 3/4, radius (r) 1/4, cutting Height (B) 5/8, shank (D) 1/2, overall length (L) 2-5/8, replacement collar 47739, replacement bearing 47721, flutes 2, Carbide Tipped bowl & Tray 1/4 radius x 3/4 dia x 5/8 x 1/2 inch Shank with upper Bb