57329 Metric Solid Carbide CNC Spiral 'O' Single Flute, Plastic Cutting 12mm Dia x 38mm x 12mm Shank x 76mm Long Up-Cut Router Bit
Amazon.com: SpeTool Single Flute (O Flute) Spiral End Mill Aluminum Cutter Carbide Router 1 inch Cutting Length with 1/4Inch Shank for Aluminum Acrylic PVC MDF Plastic : Industrial & Scientific
SpeTool 1/4 Dia O Flute 3 Inch Extra Long Upcut Spiral End Mill Cutter
1/4" Diameter O Flute Upcut Spiral End Mill CNC Router Bit - 1/4" Shank - Yonico 31014-SC
ONSRUD 63-618 3/16" Solid Carbide One Flute Upcut O Flute for Aluminum Router Bit
51489 Solid Carbide CNC Spiral 'O' Single Flute, Aluminum Cutting 1/2 Dia x 1-5/8 x 1/2 Shank x 3-1/2 Inch Long Up-Cut Router Bit