FC 40-521X 38" 18 Single Row .018"/500 Soft Grit Abrasive Cylinder Sweep/Scrub Brush for Factory Cat 420, 430 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. 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 23-421SG, .018/500 Soft Grit disc brush - 21" block diameter - also not offered by Factory Cat). Please check your unit before ordering. Two cylindrical brushes create a 42" wide scrubbing path. Two brushes required. Priced each. Not offered by Factory Cat. Our Part Number 40-521X