Spiral Router Bits: Styles, Uses, and Why They're the Best | Katz-Moses Tools
UP Cut Router Bit, 1/2 Inch Cutting Diameter, 1/2 Inch Shank, 4 Inch L
51470 Solid Carbide CNC Spiral 'O' Single Flute, Aluminum Cutting 1/16 Dia x 1/4 x 1/8 Shank x 1-1/2 Inch Long Up-Cut Router Bit: CNC Router Bits, Solid Carbide Aluminum Spiral 'O'