FC 285-821N 28" 18 Single Row Soft Nylon Cylinder Scrub Brush for Factory Cat / Tomcat 30" Cyl. Scrubbers (Magnum 30 / GTX30) with the New Style Splined Drive Hubs. Soft .014" diameter Nylon filament for light duty scrubbing of polished concrete, marble, newer epoxy painted flooring or any other sensitive flooring. Equivalent to Nylon, Nylex. Fits Factory Cat and Tomcat Magnum 30 and GTX 30 scrubbers. (Listed as a 30C New Style - 30" scrub path with brush overlap). These have newer splined hub with 6 notched hubs. For models with serial numbers ABOVE 50000. For older models with serial numbers BELOW 50000 with the slotted type drive hubs, use 28-521N. May fit models that have been converted to new splined brush drives which include 28, 2800C, 2800EX, 29, 3000C, and 350 (28" Cyl. Models). Please check your model and brush drive type before ordering. Commonly white or black in color. 2 brushes required. Priced each. Replaces Factory Cat / Tomcat FC 285-821N