Onsrud 61-061 3/16" Solid Carbide 1 Straight O Flute Router Bit | burnstools.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: Amazon.com: Industrial & Scientific
O FLUTE UPCUT – 1 FLUTE (POLISHED) – HARD PLASTIC – Southeast Tool Catalog
Yonico O Flute Upcut Spiral End Mill 1/4 in. Dia. 1/4 in. Shank Solid Carbide CNC Router Bit 31015-SC - The Home Depot