This system has been developed for nuclear power plants and concrete testing laboratories who need to do a complete removal of drill dusts for analysis purpose. The special feature of the application is that there is double extraction: first, the dusts are collected directly from the hollow drill and second, from the outside of the drill hole through a specially developed extraction hood. As a result, the drilling dusts are completely resorbed into a container provided for this purpose (available in different sizes) by the centrifugal force of the cyclone - the vacuum cleaner itself remains empty. After the application all parts of the system can easily be taken apart for cleaning. The cyclone is designed for the use of a HILTI drill hammer, a HILTI TE-CD hollow drill and a HILTI VC5-A22 accu vacuum cleaner. If used correctly, a withdrawal of 90 - 95% of the dust is assured. The individual parts are lightweight and thus transported or moved to difficult areas without much effort!