PB 241636 13" .035"/180 Mid Grit Disc Scrub Brush for Power Boss / Minuteman Scrubbers. A middle grit scrub brush for general duty scrubbing tasks. Narrow .035" diamater Tynex-A or Hahls Nylon filament impregnated with 180 grit silicon carbide granules for reaching medium and small cracks and into grout lines. Great for ceramic tile, vinyl, sealed concrete, and terrazzo. Equivalent to 180 Grit, Blue Grit, and Clean Grit. Usually blue or grey in color. Replaces blue scrubber floor pads. Not recommended for highly polished flooring surfaces. Slightly less aggressive than the .050/80 Grit brushes (241634). 13" block diameter with clip-on clutch plate. Fits many Power Boss / Minuteman models including SCV 24/26 (26" Disc Brush Models). Two brushes required. Priced each. Replaces Minuteman 241636, PB 241636