FC 25-421SS 12" .065"/46 Heavy Grit Disc Scrub Brush for Factory Cat / Tomcat (6pt. Plate). Our heaviest grit brush. Thick .070" diameter DuPont Tynex-A 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 filaments outlast standard poly and Nylon filaments. We also offer a lighter .050"/80 black grit scrub brush (FC 25-421S), or an even lighter mid grit .035"/180 grit scrub brush (FC 25-421C). Includes older style 6 point clutch plate commonly used on non-converted models with serial numbers BELOW 50000. Some newer models require a 8 point clutch plate (if an 8 point plate is needed, please reference this in the Special Instructions box at checkout). Fits Factory Cat and Tomcat branded floor scrubbers including Factory Cat GTX and Magnum Series models with serial numbers BELOW 5000. Please check your clutch plate set-up before ordering. Priced Each. Replaces Factory Cat 25-421SS. Our Part Number FC 25421SS