8mm to 12mm, 8mm to 1/2'', 1/4'' to 8mm Adapter Straight Shank
RB-123 High Precision Steel Router Collet Reducer 3/8 Overall Dia x 8mm Inner Dia x 1 Inch Long
uxcell Router Collet Driver Adapter Set Convert 8mm/12mm/12.7mm to 6mm 8mm/9.5mm/12.5mm to 6.35mm 10mm/12mm to 8mm 12mm to 10mm for CNC Engraving Bit Machine - Amazon.com
Yakamoz High Precision 6mm 6.35mm 8mm Router Collet Chuck Adapter for Engraving Trimming Machine - Amazon.com
uxcell Router Collet Extension Rod Converter Adapter 8mm to 12.7mm (1/2") for CNC Engraving Machine Woodworking Milling Bit - Amazon.com