FC 18-421SS 18" .065"/46 Heavy Grit Plus Scrub Brush for Factory Cat Tomcat 350D, 52, 5100 Disc Brush Model Scrubbers which require 8 Point Brush Drives. Our most aggressive stripping and heavy duty scrubbing brush. Long lasting .065" 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. Replaced black floor pads. 17" diameter plastic block (18" scrub path) with an 8-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 2-421SS for 6 pt.). Fits Factory Cat and Tomcat 350D (Disc Model), 52 and Tomcat 5100 floor scrubbers. Two brushes are required for model 350D, three brushes are required for models 52 and 5100. Priced Each. Replaces Factory Cat Tomcat 18-421SS, 52-421SS. Our Part Number FC 18-421SS