NSS 28-9-790-1 17" .022" Scrub-Grit Scrub Brush for NSS 1708 Series Walk-Behind Floor Scrubbers. Medium duty .022" Tynex-A or Hahls Nylon with smaller 120 grit silicon carbide granules. The scrub-grit brushes are used for general duty daily scrubbing jobs on unsealed concrete, older sealed concrete, older painted flooring, shop flooring, tile, quarry tile, rubber, slate, terrazzo and marble. Scrub-grit brushes should not be used on newer epoxy painted flooring, newer sealed concrete, or newer stained concrete (Use Nylon - NSS 2897201). Usually red or gery in color with a very slight grit textrue. Replaces red floor pads. 17" diameter plastic block includes spin-on brush drive clutch plate (28-9-010-1). Fits NSS Wrangler 1708 series walk behind floor scrubbers. One 17" diameter brush required. Priced Each. These are bundled together to reduce freight when two are ordered. Replaces NSS 28-9-790-1, 2897901. Our Part Number NSS 2897901, 28-9-790-1