Engraving Attachment CNC MastersThe router comes with a 1/4″ collet so any tool with a 1/4″ shaft will work You can also use a reducing adaptor from 1/4″ shaft to 1/8″ holder for your tools that have 1/8″ shaft The Router Attachment is designed for the CNC Jr Baron Table Top Mill and Max milling machine and requires 110v power