PB 3330408 20" .035"/180 Mid-Grit Powerdrive Style Scrub Brush for Power Boss TC/1, VS1000 Scrubbers. Our .035" diameter, 180 grit filament is great for general duty, every day scrubbing tasks on unsealed concrete, sealed concrete, older painted and epoxy painted flooring and most tile and stone surfaces. Much softer than the aggressive .070"/46 grit (3323024) brushes. Long lasting DuPont Tynex-A or Hahls Nylon filament impregnated with 180 grit silicon carbide granules. Equivalent to Powergrit 120AGS. Commonly blue in color. Not recommended for painted or epoxy painted flooring. These can be used on older painted flooring. 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 3330408, 330408