FC 28-521PS 28" 18SR .022"/120 Light Grit Cylinder Scrub Brush for Factory Cat / Tomcat 28, 2800C, 29, 3000C, 350C, 30 (MiniMag/Magnum/GTX30) Scrubbers. One of our lightest grit scrub brushes available. Soft .022" diameter DuPont Tynex-A or Hahls Nylon impregnated with 120 grit silicon carbide granules. For scrubbing epoxy painted flooring, tile, stone, polished concrete and sealed concrete flooring with light soils and debris. We can also make these brushes in a super soft .018"/500 grit (search for 28-521SG, Soft Grit or call 800-277-3780 for details). Equivalent to Light Grit. Fits Factory Cat and Tomcat 28, 2800C, 2800EX, 29, 3000C, MiniMag 30, Magnum 30, GTX 30 and 350C scrubbers which require two 28" cylindrical scrub brushes (Listed as a 30C Old Style - 30" scrub path with brush overlap). These are the OLD style scrub brushes with the slotted drive system (newer style is a "star" drive with six notches). These are for units with serial numbers BELOW 50000. Please check your unit before ordering. Two brushes required per unit. Priced each. Replaces Factory Cat / Tomcat 28-521PS. Our Part Number FC 28521PS