FC 285-821P 28" 18 Single Row Polypropylene Cylinder Scrub Brush for Factory Cat / Tomcat 30" Cyl. Scrubbers (Magnum 30 / GTX30) with the New Style Splined Drive Hubs. An economical alternative to the soft Nylon brushes, the poly scrub brushes are great for general duty scrubbing tasks on almost all flooring surfaces. The small .020" diameter poly reaches into cracks and grout lines. These can be used on sealed and unsealed concrete, polished concrete, older painted and epoxy painted flooring, tile and most stone surfaces. (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 28-521P. 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 yellow or black in color. 2 brushes required. Priced each. Replaces Factory Cat / Tomcat FC 285-821P (not currently offered by Factory Cat / Tomcat)