Align Carbide, UP Down (Compression) Router Bit, 1/4 Inch Cutting Diameter, 1/4 Inch Shank, Premium Solid Micro Grain Carbide, Spiral Plunge, 2 Flute, Flat Cutting Face, CNC Router Pro-Series. : Amazon.ca: Tools
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'