AD 56505758 11" .035"/180 Mid Grit Abrasive Disc Rotary Scrub Brush for Nilfisk Advance Scrubbers. Our third heaviest grit scrub brush for moderate soils. Great for medium to heavy duty scrubbing of sealed or unsealed concrete flooring or even aging sealed flooring surfaces. Can also be used for scrubbing tile with grout lines less than 1/2" in width. .035" diameter Tynex-A or Hahls Nylon filament impregnated with 180 grit silicon carbide granules. Equivalent to MidLite Grit, Scrub-Grit III, and Clean-Grit (Usually blue 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 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 56505758, 505758. Our Part Number AD 56505758