FC 285-821SG 28" 18 Single Row .018"/500 Soft Grit Non-Abrasive Cylinder Scrub Brush for Factory Cat / Tomcat 30" Cyl. Scrubbers (Magnum 30 / GTX30) with the New Style Splined Drive Hubs. Not offered by Factory Cat or Tomcat. Our softest non-abrasive cylindrical scrubbing brush for light duty scrubbing jobs on polished, epoxy painted or other sensitive flooring surfaces. Long lasting, .018" DuPont Tynex-A Nylon filament impregnated with our lightest 500 grit silicon carbide granules. Lighter and softer than Light Grit. 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 28-521SG. 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 grey or light green in color. Equivalent to Dyna-Scrub, Mal-Grit Lite and Lt. Green Grit. 2 brushes required. Priced each. Not offered by Factory Cat - Use FC 285-821SG