FC 11-421SS 11" .070"/46 Heavy Grit Scrub Brush for Factory Cat Tomcat Floor Scrubbers. Our most aggressive brushes. Thick .070" diameter DuPont Tynex-A or Hahls or Hahls Nylon filament is impregnated with large abrasive 46 grit silicon carbide granules. These heavier grit brushes can be used on older shop flooring with heavy packed debris, older sealed concrete, and unsealed concrete. The Super Grit brushes can also be used for stripping of tile, terrazzo, quarry tile, and other similar hard surfaces. Equivalent to Super-Grit, .065"/46 Heavy Grit Plus. Replaces black and high productivity floor pads. Not for use on newly painted flooring. Tynex-A or Hahls or Hahls filaments outlast standard poly and Nylon filaments. We also offer a lighter .050"/80 black grit scrub brush (FC 11-421S), or an even lighter mid grit .035"/180 grit scrub brush (FC 11-421C). Includes 8 point clutch plate. Some older models require a 6 point clutch plate (if a 6 point plate is needed, please reference 11-421SS-6P in the Special Instructions box at checkout). Please check your existing brush set up before ordering. Fits Factory Cat and Tomcat branded floor scrubbers including Factory Cat model 21 and Tomcat 2100-D. Commonly listed as 10" brushes. Most machines require two brushes. Priced Each. Replaces Factory Cat Tomcat 11-421SS. Our Part Number FC 11-421SS