In a production environment, insert Tooling reduces downtime to a minimum. Each throw-away insert Knife in this flush trimming bit has multiple edges. Rotate the knife to expose a fresh cutting edge. Tips can be replaced at any time, even mid-job, without changing the router setup. Has four cutting edges per knife.#Rc-1004, diameter (D): 3/4, cutting height (B): 30mm, Shank (D): 1/2, overall length (L): 3-D/4, replacement bearing: 47111, replacement knives: ick-30, flutes: 2, RC-1004 insert solid carbide flush trim 3/4 dia x 1-1/8 x 1/2 inch shank