Fits any quick change system including Festool's Centrotec. These FISCH chatter and burr free snail countersinks are part of our Quick Change System and can be used either directly mounted into a drill chuck or used in conjunction with any quick-change hex recess chuck. They can be used on a wide range of materials including high grade steel, synthetics, wood and both alloyed and non-alloyed steels. The hardened shank conforms to DIN3126.E6.3. Available in 5-13mm and 7-20mm. Made in Austria.