Whiteside Trademark (Made in USA) Router bits are my number one choice. The RD4700 (looks like an old Yamaha I had) is a quality spiralizer. 1/2" shank for stability and drop helix for a clean entry point with no disruptions. Hartville Tool is a great company to do business with. I have never been disappointed. This is used in a plunge router jig setup with guides and start/end stops Be sure.