Stainless steel single-stem with side tufts for power tool use. Provides a high degree of fill stiffness with minimal flexing. Use for cleaning and polishing inner walls of tubes, cylinders and blind-threaded holes. Option of carbon steel or stainless steel fill material. Can also be used with our side action brush holders >, which slightly reduces fill trim length for a stiffer, more aggressive brush action that can be driven at a higher RPM.