PB 241634 13" .050"/80 Grit Nylo-Grit Disc Scrub Brush for Power Boss / Minuteman Scrubbers. Very aggressive .050" diameter Tynex-A or Hahls Nylon impregnated with 80 grit silicon carbide granules. These heavy duty scrub brushes are designed for aggressive scrubbing and stripping jobs. These can be used on unsealed concrete, asphalt or sealed flooring with heavy dirt and debris. Commonly black in color. Replaces black floor pads. Not recommended for sensitive flooring surfaces. Slightly less aggressive than the .065/46 Grit brushes (241635). 13" block diameter with clip-on clutch plate. Fits many Power Boss / Minuteman models including SCV 24/26 (26" Disc Brush Models). Will not fit E26 scrubbers. Two brushes required. Priced each. Replaces Minuteman 241634, PB 241634