PB 7826 17" .018"/500 Light Grit Scrub Brush for Minuteman Power Boss Phoenix 33 and E33 Disc Brush Model Floor Scrubbers. Our lightest grit brush. This .018"/500 grit brush is perfect for light duty scrubbing on polished concrete, stone, marble, sealed and unsealed concrete. The small diameter crimped DuPont or Hahls nylon filaments are imbedded with 500 grit silicon carbide granules. Great for light scrubbing of grout. For heavier duty scrubbing jobs, use our .035"/180 Mid/Heavy Grit (PB 7843) or .040"/120 Extra Heavy Grit (PB 7845). Fits Minuteman Power Boss Phoenix 33 walk behind scrubbers. Also fits Hakomatic B70/B90, B1050/TB1230, B1100/TB1230, B310R/TB1230 (85cm Models). Listed as Medium Duty 600 Grit Gray. Comes prepped with 18 tooth splined clutch plate. Two brushes required. Priced Each. Replaces Minuteman Power Boss 7826, 99782600. Our Part Number PB 7826