For when you buy a cheap flex shaft from eBay, but it doesn't fit your Dremel.
http://www.ebay.com.au/itm/Flex-Flexible-Shaft-Attachment-For-Rotary-Tool-4000-400-398-395-300-285-275-8200-/130720964908?pt=AU_Tool_Parts_Accessories&hash=item1e6f93a12c&_uhb=1
