FC 5-421N 19" .016" Soft Nylon Scrub Brush for Factory Cat Tomcat 38, 40, 40HD, 3700 Disc Brush Model Scrubbers, 6 Point Drive Plate. General duty and long lasting soft .016" diameter level white or black Nylon. These soft Nylon scrub brushes are great for light duty scrubbing of some polished hard surfaces and most delicate medium to soft surfaces. These soft nylon brushes will not harm polished flooring found in some plants and auto dealership showrooms. Designed for light dirt and debris. For a slightly stiffer Nylon for most surfaces such as grit impregnated epoxy painted floors, use our .030" diameter Nylon (FC 5-421N30). 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 19-421N for 8pt.). 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 5-421N. Our Part Number FC 5-421N