NSS 33-9-052-1 17" .050"/80 Black Grit Abrasive Scrub Brush for NSS Wrangler 33, 3330 Walk-Behind Scrubbers and Champ 3329 Riding Scrubbers. Abrasive .050" diameter DuPont Tynex-A or Hahls Nylon filament impregnated with 80 grit silicon carbide granules for aggressive scrubbing and stripping jobs. These brushes can be used on unsealed concrete, asphalt, or on older sealed concrete with heavy soils. These can also be used for removing paints or sealers once stripper is applied. Usually black in color with a notable grit textrue. Fits NSS Wrangler 33 and 3330 walk behind scrubbers and the NSS Champ 3329 riding floor scrubber. 16" brush block, 17" scrub path. Includes 3 drive lugs. Each machine requires two brushes. These are commonly bundled together to reduce freight. Not manufactrued by NSS. Priced each. Replaces NSS 3390521, 33-9-052-1. Our Part Number NSS 33-9-052-1