FC 5-421S 19" .050"/80 Nylo-Grit Scrub Brush for Factory Cat Tomcat 38, 40, 40HD, 3700 Disc Brush Model Scrubbers, 6 Point Drive Plate. Our second most aggressive stripping and heavy duty scrubbing brush. Long lasting .050" diameter DuPont Tynex-A Nylon is impregnated with large 80 grit silicon carbide granules. These brushes are designed for stripping jobs and heavy duty scrubbing jobs on most hard surfaces. Equivalent to Tough-Grit. Commonly black in color. Replaces brown or black 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 19-421S for 8pt.). We also offer a more aggressive brush for heavier dirt and debris (use FC 5-421SS, Super-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 5-421S. Our Part Number FC 5-421S