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, including Festool's Centrotec. 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.