FC 28-521S / 28-521G 28" 18 Single Row .050"/80 Grit Heavy Abrasive Cylinder Scrub Brush for Factory Cat Tomcat 28, 2800C, 29, 3000C, 350C, 30 (MiniMag/Magnum/GTX30) Scrubbers. An abrasive cylindrical scrubbing brush for heavy duty scrubbing or stripping jobs. Long lasting .050" Tynex-A Nylon filament impregnated with 80 grit silicon carbide granules. Equivalent to Tough 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. A heavier .060"/46 grit brush can also be made. Call us at 800-277-3780 for details. Two brushes required per unit. Priced each. Replaces Factory Cat Tomcat 28-521S, 28-521G. Our Part Number FC 28-521S