The Dremel Forti-Flex has a fully adjustable chuck interface (up to 4mm) for accessories and so can fit any current Dremel Multitool accessory of any mandrel size without the use of multiple collets. The Dremel Forti-Flex should not be used with Dremel Trio accessories as these 4.8mm mandrels are too big for the Forti-Flex chuck. Dremel Multi-Max, Engraver and VersaTip/VersaFlame accessories are also not compatible.