FC 18-421P 18" .030" Poly Scrub Brush for Factory Cat Tomcat 350D, 52, 5100 Disc Brush Model Scrubbers which require 8 Point Brush Drives. General duty and economical .030" diameter blue or black polypropylene. Equivalent to Poly (.028). Polypropylene brushes are great for light duty scrubbing of all hard surfaces and some delicate surfaces. For a longer wearing brush, use our .030" diameter Nylon (FC 18-421N30). 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 2-421P for 6 pt.). Fits Factory Cat and Tomcat 350D, 52 and Tomcat 5100 Disc Model floor scrubbers (some of these models also take cylindrical brushes. Please check your unit before ordering). Two brushes are required for model 350D, three brushes are required for models 52 and 5100. Priced Each. Replaces Factory Cat Tomcat 18-421P, 52-421P. Our Part Number FC 18-421P