The Dremel 3000 rotating multi-tool comes with a Flex Shaft tool, which is used for high precision work like engraving, polishing, carving and fine finishing. It is a little different to other tools in the Dremel range in that some disassembling of the Dremel is needed to attach it. This video shows you how.
The Dremel I purchased was from Amazon amzn.to/3W4eKRG
I also have a video on the unboxing of a Dremel 3000, what's in the box, and overview of the Dremel 3000, what tools it contains and what they are used for.