FC 17-421SS 17" .070"/46 Grit Super Grit Scrub Brush for Factory Cat Tomcat Floor Scrubbers. 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 Nylo grit scrub brush (FC 17-421S), or an even lighter mid grit .035"/180 grit scrub brush (FC 17-421C). Includes 8 point clutch plate. Some older models require a 6 point clutch plate (if a 6 point plate is needed, please reference this in the Special Instructions box at checkout). Please check your existing brush set up before ordering. Fits Factory Cat and Tomcat branded floor equipment including Factory Cat MicroMag 17D, 2017-17, Magnum 34D, GTX 34D, 3300, 3400 walk-behind floor scrubbers and model 250-17, 35, 490, XR-34 riding scrubbers. May also fit other models. One (MicroMag 17D, 2017-17), two (250-17, 3300, 3400, 35, GTX 34D, Magnum 34D, XR-34), or three (490) rotary disc brushes are required per unit. Priced Each. Replaces Factory Cat 35-421SS, 17-421SS. Our Part Number FC 17-421SS.