These high quality plug cutters have twin cutters to give a clean, perfectly cylindrical plug in soft and hardwood. Ground from one piece of steel making them very strong, they have a specially tempered universal Quick Change System shank, meaning they are universal and will fit into any system including Festool's Centrotec. These are specifically designed to work in battery operated drills giving you more holes per battery charge. Hardened shank conforms to DIN3126.E6.3. Made in Austria.