FC 13-421S 12" Nylo-Grit 80 Grit Disc Scrub Brush for Factory Cat 25, Tomcat 2500, MiniMag 26D, Magnum 26D and GTX 250-26D Disc Brush Scrubbers. Our second most aggressive grit filament. Heavy duty .060", 80 Grit Nylo-Grit Plus scrub brushes are designed for extra heavy duty scrubbing or stripping jobs. These are commonly used on unsealed concrete flooring with heavy debris. Includes 8-Point clutch plate with spring clip. Usually black in color. Equivalent to Tough Grit. 12" diameter block with a 13" scrub path. Commonly listed as a 13" brush. Most machines require two brushes, priced each. These are commonly bundled to reduce shipping costs. If a more aggressive brush is needed, use FC 13-421SS, Super Grit. Some of these models require either disc or cylinder scrub brushes. Please check your model before ordering. Replaces Factory Cat Tomcat 13-421S. Our Part Number FC 13-421S