FC 22-521S 22" .050"/80 Grit Cylinder Scrub Brush for Factory Cat and Tomcat Floor Scrubbers. .050" diameter grit brushes are great for aggressive scrubbing or stripping of sealed or unsealed concrete flooring. Our most aggressive brush in this series. Commonly black in color. Equivalent to Nylo-Grit or Tough Grit. Fits Factory Cat and Tomcat 22, 2200C, Mini 24, MiniMag 24, Magnum 24, and GTX 24 scrubbers which require two 22" cylindrical scrub brushes (Listed as a 24C Old Style - 24" 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. For models with serial numbers ABOVE 5000, search for FC 225-821S. Please check your unit before ordering. For a slightly less aggressive brush, use our FC 22-521C (.035" Mid Grit). Two brushes required per unit. Priced Each. Replaces Factory Cat / Tomcat FC 22-521S. Our Part Number FC 22-521S