FC 5-421C 19" .035"/180 Mid-Grit Scrub Brush for Factory Cat Tomcat 38, 40, 40HD, 3700 Disc Brush Model Scrubbers, 6 Point Drive Plate. Our most popular grit scrubbing brush for everyday scrubbing of hard surfaces such as sealed concrete, unsealed concrete, tile, terrazzo, travertine, older epoxy painted flooring and shop floors. Long lasting .035" diameter DuPont Tynex-A Nylon is impregnated with medium sized 180 grit silicon carbide granules. Equivalent to Midi-Grit, Scrub-Grit 3. Commonly grey or blue in color. Replaces blue floor pads. 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 19-421C for 8pt.). We also offer two more aggressive brushes for heavier dirt and debris (use FC 2-421SS, Super-Grit Equivalent or FC 2-421S Tough-Grit Equivalent). 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 5-421C. Our Part Number FC 5-421C