FC 325-821PS 32" 18 Single Row .022"/120 Light Grit Cylinder Scrub Brush for Factory Cat / Tomcat Magnum 34, GTX 34 Scrubbers with the New Style Splined Drive Hubs. 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 325-821SG, Soft Grit or call 800-277-3780 for details). Equivalent to Light Grit. Usually red or grey in color. 32" Length (Listed as a 34C New Style - 34" 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 32-521PS. May fit models that have been converted to new splined brush drives which include 34, 3400C, 35, 35SS, 38, 40, 40HD, and 350 (32" Cyl. Models). Please check your model and brush drive type before ordering. 2 brushes required. Priced Each. Replaces Factory Cat / Tomcat 325-821PS