SpeTool Spiral Router Bits with UpCut 1/4 inch Cutting Diameter, 1/4 inch Shank 3 inch Extra Long HRC55 Solid Carbide CNC End Mill for Wood Cut, Carving - - Amazon.com
Spiral Router Bits vs. Straight Router Bits
Whiteside Flush Trim Up/Down Cut Spiral Bit | Woodpeckers
DIABLO 1/4 in. x 1 in. Carbide Up Spiral Router Bit DR75102 - The Home Depot