T19S Rotobrush steel, 100mm, is a fine wire brush used to clean and open the coating structure prior to wax application. Can also be easily used as a second brush after a horsehair brush. Before first use we recommend you dull the steel brush using sandpaper #100. To attach the rotobrush on a drill, you need a Roto Cover, eg T15-100. Attach the steel 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.