51475 Solid Carbide CNC Spiral 'O' Single Flute, Aluminum Cutting 3/16 Dia x 3/8 x 3/16 Shank x 1-1/2 Inch Long Up-Cut Router Bit
Amana Tool 51373 SC Spiral O Single Flute, Aluminum Cutting 1/8 D x 5/16 CH x 1/4 SHK x 1-1/2 Inch Long Up-Cut Router Bit with Mirror Finish - - Amazon.com
China 3mm Shank Single Flute End Mill for Acrylic and Aluminum - China Endmill, Router Bits