FC 447-821PS 44" 16 Single Row .022"/120 Light Grit Cylinder Sweep/Scrub Brush for Factory Cat XR 45-C 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 447-821SG, Soft Grit or call 800-277-3780 for details). Equivalent to Light Grit. Usually red or grey in color. 44"L x 7"OD. Fits Factory Cat XR 45-C cylindrical scrub brush riding scrubbers. Some units (called XR-45 or XR-46, Disc) require two 23" disc brushes instead of cylinder brushes (use two 23-421PS Light Grit equivalent - 22" block diameter). Please check your unit before ordering. Two cylindrical brushes create a 46" wide scrubbing path. Two brushes required. Priced each. Replaces Factory Cat 447-821PS