FC 20-421PS 20" Light Grit Disc Scrub Brush for Factory Cat Tomcat Floor Scrubbers. A fine, mild aggressive grit scrub brush designed for every day scrubbing jobs on hard surfaces. Used for removal of moderate to light dirt and soils on newer sealed concrete, textrued concrete, polished concrete, terrazzo, non-slip flooring, slate, travertine, rubber, VCT, and other hard industrial surfaces. Light Grit scrub brushes consist of a small .022" diameter DuPont Tynex-A Nylon filament impregnated with 120 grit silicon carbide granules. Commonly red or grey in color. Equivalent to Light Grit, Scrub-Grit 2, and red floor pads. Not recommended for use on newer painted or epoxy painted flooring, use FC 20-421P (Poly) or FC 20-421N (Soft Nylon). For a slightly more aggressive disk brush, use FC 20-421C, Mid-Grit (.035/180grit). We can also make these in a softer .018"/500grit material if needed (Order these brushes and reference 018/500 in the special instructions box at checkout. Fits Factory Cat and Tomcat scrubber models including Factory Cat MicroMag 20D, XR-40, 2017-20 and 2023-20. The XR Series and 2017/2020 Series have other models which require different diameter scrubbing brushes. Please check your existing brush block diameter before ordering. These are manufactrued on a 19" diameter heavy duty poly scrubbing block and have a 20" wide scrub path. Two brushes are required for the XR-40. One brush required for the MiniMag 20D, 2017-20, 2023-20. Includes the 8 point clutch plate. Priced Each. Replaces RPS Factory Cat Tomcat 20-421PS. Our Part Number FC 20-421PS