NSS 7693541 18" .035"/180 Grit Scrub-Grit Scrub Brush for NSS Champ 3529RB and ZS 35 Riding Floor Scrubbers. .035" diameter Tynex-A or Hahls Nylon filaments are impregnated with 180 grit silicon carbide granules for general duty scrubbing jobs. These can be used on unsealed concrete, older sealed concrete, tile, quarry tile, rubber, textrued concrete and older painted flooring. Great for cleaning grout lines. Not recommended for use on newly painted or epoxy painted flooring (use Nylon, NSS 7693521). 17" diameter plastic block with 3 metal mounting lugs. 18" wide scrub path. Usually blue in color. Fits NSS Champ 3529RB and ZS 35 series riding floor scrubbers. Two brushes required. Priced Each. These are bundled together to reduce freight when two are ordered. Replaces NSS 7-69-354-1, 7693541. Our Part Number NSS 7693541