Use this bit for template or pattern work where the workpiece is unusually thick. The Two-Flute configuration cuts fast and produces a smooth finish.For a superior finish, Use the three-flute version. Twin bearings on selected tools provide better contact with reference edge and more stability in the cut. Denotes double ball bearing for added stability, #47128-2, diameter (D): 1/2, cutting Height (B): 1-1/2, Shank (D): 1/2, overall length (L): 4-1/16, replacement bearing: 47706, flutes: 3, 47128-2 carbide Tipped flush trim 1/2 dia x 1-1/2 x 1/2 inch Shank with double ball bearing 3-flute Extra-Long