FC 5-421SS 19" .065"/46 Heavy Grit Plus Scrub Brush for Factory Cat Tomcat 38, 40, 40HD, 3700 Disc Brush Model Scrubbers, 6 Point Drive Plate. Our most aggressive stripping and heavy duty scrubbing brush. Long lasting .070" diameter DuPont Tynex-A or Hahls Nylon is impregnated with large 36 grit silicon carbide granules. These brushes are designed for stripping jobs and heavy duty scrubbing jobs on most hard surfaces. Equivalent to Super-Grit. Replaces black stripping pads. 18" diameter plastic block (19" scrub path) with an 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 19-421SS for 8 pt.). Some of these models also take cylindrical scrub brushes. Please check your model before ordering. Fits Factory Cat Model 38, 40, 40HD and Tomcat 3700 disc brush model floor scrubbers. Two brushes are required per unit. Priced Each. Replaces Factory Cat Tomcat 5-421SS. Our Part Number FC 5-421SS