SpeTool Spiral Router Bits with UpCut 1/4 inch Cutting Diameter, 1/4 inch Shank 3 inch Extra Long HRC55 Solid Carbide CNC End Mill for Wood Cut, Carving - Amazon.com
UP CUT Router Bit, 1/4 Cutting Diameter, 1/4 Inch Shank, Premium Solid
8mm, Upcut Spiral Router Bit, 1/2 Shank, Model 8*45-100 1/2 - Power Tool Accessories - AliExpress
Bosch 1/4-in Solid Carbide Upcut Spiral Router Bit in the Straight & Mortising Router Bits department at Lowes.com