FC 5-421PS 19" .022"/120 Light Grit Scrub Brush for Factory Cat Tomcat 38, 40, 40HD, 3700 Disc Brush Model Scrubbers, 6 Point Drive Plate. Long lasting .022" diameter DuPont Tynex-A Nylon is impregnated with medium sized 120 grit silicon carbide granules. Equivalent to Light Grit, Scrub-Grit 2. Commonly grey or red in color. Replaces red floor pads. Our most popular light grit scrubbing brush for everyday scrubbing of hard surfaces such as sealed concrete, unsealed concrete, marble, vinyl tile, quarry tile, rubber flooring, terrazzo, travertine, older epoxy painted flooring and shop floors. The smaller .022" diameter is great for cleaning grout lines. 18" diameter plastic block (19" scrub path) with a 6-point clutch plate (Please check your model for the proper number of points. We offer a 6 point and 8 point clutch plate. Use FC 19-421PS for 8pt.). We also offer a slightly more aggressive brush for heavier dirt and debris (use FC 5-421C, Midi-Grit Equivalent) or a slightly lighter grit for less aggressive scrubbing (use Our Part Number FC 5-421X Dyna-Grit 500 grit). Fits Factory Cat Model 38, 40, 40HD and Tomcat 3700 disc brush model floor scrubbers. Some of these models may take cylinder brushes instead of disc brushes. Please check your model before ordering. Two brushes are required per unit. Priced Each. Replaces Factory Cat Tomcat 5-421PS. Our Part Number FC 5-421PS