T17W Rotobrush nylon, 100mm, is used for polishing after you're done with the plexiscraper and the horsehair brush, removing the wax you have applied on you're skis or snowboards. To attach the rotobrush on a drill, you need a Roto Cover, eg T15-100. Attach the nylon brush on the Roto Cover T15-100 . Then attach Roto Cover with the brush on a drill with a minimum rotation speed of 1500 rpm. Move the brush in overlapping movements from the tip to the back.