Swix Racing Roto Steel XC 70 mm - The Racing Roto Steel Cross Country 70mm brush is part of the Swix series of XC brushes in 70mm, allowing you to combine the brushes that best suit your purpose. Use the steel brush to clean the base of your skis before applying hot wax. Attach two 70mm brushes to the 140mm Roto cover handle. Then attach the Roto Cover with the brushes to your drill. Because you are attaching a 70mm brush to a 140mm Roto Cover handle, you can easily combine brushes on the Roto Cover handle. A steel brush and a horsehair brush. For best results, we recommend using a drill with a minimum speed of 1800 rpm.