NSS 7693521 18" .030" Nylon Scrub Brush for NSS Champ 3529 RB and ZS 35 Riding Floor Scrubbers. Medium .030" level white Nylon brushes are great general duty scrubbing brushes. These can be used on epoxy painted flooring, sealed concrete, stained concrete, vinyl and any other hard surface where the heavier grit brushes can't be used. Nylon brushes outlast poly scrub brushes. 17" diameter plastic block with 3 metal mounting lugs. 18" wide scrub path. 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. These can also be made in a softer .020" or .014" Nylon. Please call 800-277-3780 for details. Replaces NSS 7-69-352-1, 7693521. Our Part Number NSS 7693521