FC 447-821SG 44" 16 Single Row .018"/500 Soft Grit Cylinder Sweep/Scrub Brush for Factory Cat XR 45-C Riding Floor Scrubbers. Not offered by Factory Cat. Long lasting, .018" DuPont Tynex-A Nylon filament impregnated with our lightest 500 grit silicon carbide granules. Lighter and softer than Light Grit. These can be used on newer sealed or painted floors. Great for textrued epoxy painted flooring. Usually grey or light green 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 of our 23-421SG Light Grit equivalent - 22" block diameter brushes, also not offered by Factory Cat). Please check your unit before ordering. Two cylindrical brushes create a 46" wide scrubbing path. Two brushes required. Priced each. Not offered by Factory Cat. Our Part Number 447-821SG