FC 40-521PS 38" 18 Single Row .022"/120 Light Grit Abrasive Cylinder Sweep/Scrub Brush for Factory Cat 420, 430 Riding Floor Scrubbers. Soft .022" diameter DuPont Tynex-A Nylon impregnated with 120 grit silicon carbide granules. For scrubbing epoxy painted flooring, tile, stone, polished concrete and sealed concrete flooring with light soils and debris. We can also make these brushes in a super soft .018"/500 grit (search for 40-521SG, Soft Grit or call 800-277-3780 for details). Equivalent to Light Grit. Usually red or grey in color. 38"L x 9"OD. Fits Factory Cat 420-C and 430-C cylindrical scrub brush riding scrubbers. Some units (420, Disc) require two 22" disc brushes instead of cylinder brushes (use two 23-421PS, .022" Light Grit equivalent disc brush - 21" block diameter). Please check your unit before ordering. Two cylindrical brushes create a 42" wide scrubbing path. Two brushes required. Priced each. Replaces Factory Cat 40-521PS. Our Part Number FC 40-521PS