Spiral bits produce Razor-Sharp cutting edges in flush trimming. The twin ball-bearing pilot enhances the stability of the tool. This bit offers an 'Up-cut' And 'down-cut' Combination, #46192, diameter (D) 1/2, cutting Height (B) 1-1/4, Shank (D) 1/2, overall length (L) 4, B1 7/16, replacement bearing 47701 (2), washer 67053, locking ring 47752, flutes 2, solid carbide compression spiral 1/2 dia x 1-1/4 x 1/2 inch Shank with double ball bearing