Whiteside - 6400X8 Router Bit Shank Reducer 1/2" to 8mm
1PC 1/4 Inch 8mm 1/2 Inch Shank Router Bit Extension Rod Converter Collet Extension Chuck Engraving Machine Accessories Extension Milling Cutter Router Bit for Wood (8mm-1/2") - - Amazon.com
Saipe 6pcs High Precision Trimmer Collet Adapter 6mm 1/4" 8mm Router Bit Collet Chuck Clamping Adapter for Engraving Trimming Machine Electric Router Milling Cutter - - Amazon.com
A-XINTONG 1/4" 8mm 1/2" Shank Router Bit Extension Chuck Adapter with 4PCS 1 /4", 8mm, 12mm, 1/2" ER20 Spring Collet, ER20 M Type Collet Chuck Wrench Spanner for Milling Cutter Router Bit (1/4+ER20) - -