KATUR Top and Bottom Bearing Flush Trim Router Bits, Woodworking Milling Cutter Router Bit with 1/4 Inch Shank and 25mm Cutting Length (Yellow,1/4" Shank, 25mm Depth) - - Amazon.com
HUHAO 1/4 Inch Shank Router Bit 25mm Cut Dia Woodworking Cutter Tool for Door Window - - Amazon.com
Ultra 6.4 x (10mm to 25mm) Straight Router Bit (Pack of 2) - AUSTRALIA BRAND | eBay
Carbide Compression Router Bit Up&Down End Mills 6mm Shank with 6mm Cutting Dia ,25mm CEL for CNC Mill Machine Wookwork 3D Profile Detail Engraver Carving 1PCS - Walmart.com