PB 3331083 48" .065"/46 Grit Super Abrasive Cylindrical Main Sweep/Scrub Broom for Power Boss 9090, Monitor 90 Series Double Scrubbers. Our heaviest grit for aggressive scrubbing of unsealed or older sealed concrete floors with heavy dirt and debris. The heavy grit brushes can also be used for stripping finish and sealers from sealed concrete flooring. Long lasting DuPont Tynex-A or Hahls Nylon impregnated with large 46 grit silicon carbide granules are arranged in a high density 24 single row configuration. Fits double scrubbers from Power Boss including 9090 and Monitor 90 scrubbers which require one 48" cylinder sweep/scrub brushes. These units also require clip-on power drive style disc scrub brushes; 3 standard and 4 if using a side scrub brush option. Equivalent to Powergrit 46HDS, Mal-Grit Xtra and Brown Grit. Priced each. 1 cylinder scrub/sweep brush required per unit. Replaces Power Boss 3331083. Our Part Number PB 3331083, PB 3331083