PB 7843 17" .035"/180 Mid Grit Scrub Brush for Minuteman Power Boss Phoenix 33 and E33 Disc Brush Model Floor Scrubbers. Our second heaviest grit brush. This .035"/180 grit brush is perfect for medium to heavy duty scrubbing on quarry tile, older sealed and unsealed concrete (Not recommended for newly painted or epoxy painted floors). The .035" diameter crimped DuPont or Hahls nylon filaments are imbedded with 180 grit silicon carbide granules. Great for scrubbing grout. For heavier duty scrubbing jobs, use our .040"/120 Extra Heavy Grit (PB 7845). If a lighter grit is needed, use our Light Grit .018"/500 (PB 7826). Fits Minuteman Power Boss Phoenix 33 walk behind scrubbers. Also fits Hakomatic B70/B90, B1050/TB1230, B1100/TB1230, B310R/TB1230 (85cm Models). Listed as Heavy Duty PA6 Gray 180 Grit. Comes prepped with 18 tooth splined clutch plate. Two brushes required. Priced Each. Replaces Minuteman Power Boss 7843, 99784300. Our Part Number PB 7843