Fits any quick change system, including Festool's Centrotec. These are part of our universal Quick Change System for added convenience. These very high quality Forstner cutters have an excellent cutting edge that will give clean smooth cuts every time. A very important point is that for strength the bits have been manufactured from one piece of steel with the shank especially tempered to DIN316-E6,3. Designed for tools that accept 1/4" shank hex as well as standard drill chucks, these Forstner cutters will perform in soft and hardwood as well as in manufactured boards.