This nozzle allows you to make large round holes in plasterboard or wooden walls. The diameter of the hole can be adjusted from 40 to 200mm. A handheld electric drill with a 10mm chuck is required to work with the nozzle. The ballerina consists of a drill bit in the center and a cutting blade on both sides.  The kit comes with 10 drills of different sizes and for different materials. The tool is packed in a plastic case with a handle for easy storage and carrying.