PB 3330409 20" .018"/500 Soft Grit Powerdrive Style Scrub Brush for Power Boss TC/1, VS1000 Scrubbers. Our lightest grit brush available in this series. Soft .018" diameter 500 grit scrub brush. Long lasting DuPont .018"/500 grit scrub brushes can be used for light scrubbing of sealed and epoxy painted flooring. These brushes have the advantage of long life as compared to their Nylon or Poly counterparts. Will not damage older painted or epoxy painted flooring. Do not use on newly painted flooring or those with a high shine, ask us about 20" soft nylon brushes. These brushes are also great for lighter cleaning of small grout lines. Equivalent to Powergrit 500 GPS. Commonly light green or red 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 3330409, 330409