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 two cutting edges per knife. This tool is meant for difficult work. The knives are Held with 3 screws.#Rc-1007, diameter (D): 3/4, cutting height (B): 50mm, Shank (D): 1/2, overall length (L): 4-1/4, replacement collar: 47739, replacement bearing: 47711 (bottom) 47721 (2 top), replacement knives: rck-151, flutes: 2, RC-1007 insert solid carbide flush trim 3/4 dia x 50mm x 1/2 inch shank