These router bits Yield cuts which are cleaner than typical insert bits, Offering high speed cuts with super clean finish. They also are channel set, double edge knives. Each blade has a double-sided cutting edge for economy. The insert carbide is much harder than brazed carbide. There is minimum amount of downtime for blade changes.#Rc-3200, (D) diameter: 1/2, (b) Cutting height: 30mm, (D) shank: 1/2, overall length (L): 3-D/8, replacement screw: 67016, replacement knives: rck-34, flutes: 2, RC-3200 CNC insert straight 1/2 dia x 30mm x 1/2 inch shank