AD 56505752 11" .050"/80 Grit Abrasive Disc Rotary Scrub Brush for Nilfisk Advance Scrubbers. Our second heaviest grit scrub brush for stubborn soils. Great for heavy duty scrubbing or stripping of unsealed concrete flooring or aging sealed flooring surfaces. .050" diameter Tynex-A or Hahls Nylon filament impregnated with 80 grit silicon carbide granules. Equivalent to Dyna Grit, Nylo-Grit, and Mal-Grit (Usually black in color). Filament is set in an 11" diameter solid heavy duty plastic molded block. Includes 3 mounting drive lugs. Fits Nilfisk Advance scrubbers including Adgressor 3520 (with 35" disc scrub deck), Adgressor BR 950S, Advenger 2400D, Advenger BR 600S, 1700, 2067, Convertamatic 24D-C, X24D-C, 240, HydroRetriever 240, Trac 240, 240HD, 240LX, 240HR, and 4500 These brushes have a 5-1/2" center hole. Many machines require two, or in some cases, 3 or 4 brushes. Please check your machine before ordering. Often listed as 12". Replaces Nilfisk-Advance 56505752, 505752. Our Part Number AD 56505752