AD 56505754 11" .028" Poly Rotary Disc Scrub Brush for Nilfisk Advance Scrubbers. Economical, general duty polypropylene is great for scrubbing moderate soils. Poly brushes can be used on almost all surfaces. A cheaper alternative to longer lasting Nylon scrub brushes. Equivalent to Prolene, Poly, Polypro (Usually bright blue or black in color). Filament is set in a 15" diameter solid heavy duty plastic molded block. Includes 3 mounting drive lugs. 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 56505754, 505754. Our Part Number AD 56505754