46327 Solid Carbide Slow Spiral O Flute, Acrylic Cutting 1/4 Dia x 3/4 x 1/4 Inch Shank Up-Cut Single Flute 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 : Musical Instruments
Onsrud Cutter 63-848 10mm Solid Carbide 1 Upcut Spiral O Flute Router Bit | burnstools.com
O Flutes For Mechanical Plastics
SpeTool 1/4 Dia 3 Inch Long O Flute End Mill Acrylic and Plastic Cutter
Whiteside Router Bits RU2074A Single O-Flute with Spiral Up Cut 1/4-Inch Cutting Diameter and 3/4-Inch Cutting Length - - Amazon.com
SHAPER ⅛” X ½” Up-Spiral O-flute Router Bit SE1-2500-5000C - Sulphur Grove Tool