PB 3330407 20" .050"/80 Grit Nylo-Grit Powerdrive Style Scrub Brush for Power Boss TC/1, VS1000 Scrubbers. Our second heaviest grit scrub brush for aggressive scrubbing and stripping jobs. Designed for cleaning packed dirt and heavy debris on unsealed concrete, older sealed concrete and asphalt surfaces. Long lasting DuPont Tynex-A or Hahls Nylon filaments are impregnated with large 80 grit silicon carbide granules and are arranged in a 6 row configuration on a solid plastic molded brush block. For a heavier grit brush, search for 3323024, .070"/46 Grit. Not recommended for polished concrete, painted or epoxy painted flooring. Usually black in color. Includes new style molded "powerdrive" clutch plate set up with attachment hardware. Fits many Minuteman and Power Boss Scrubbers including TC/1 and VS1000. Most machines require two scrub brushes per unit. Priced each. Replaces Minuteman / Power Boss 3330407, 330407