FC 15-421SS / 29-421SS 15" .065" Grit Super Abrasive Disc Scrub Brush for Factory Cat Pilot 28, Models 29, 29SS, 290, GTX 30, Magnum 30", 250-15, Tomcat 3000, XR45 Disc Brush Scrubbers which require 15" disc scrub brushes. Our most aggressive grit filament. Heavy duty .065" or .070", 46 Grit .065"/46 Heavy Grit Plus scrub brushes are designed for extra heavy duty scrubbing or stripping jobs. These are commonly used on unsealed concrete flooring with heavy debris. Equivalent to Super-Grit. Replaces high productivity black stripping pads. Includes 8-Point clutch plate with spring clip (older model 29's took a six point plate, 7-421SS. If these 6pt. brushes are needed, please add this item to your cart and reference 7-421SS6 in the Special Instructions box at checkout). Please check your existing brush set up before ordering. Usually orange or purple in color. 14" diameter block with a 15" scrub path. Commonly listed as a 15" Brush . Most machines require two brushes, priced each. These are commonly bundled to reduce shipping costs. Fits Factory Cat Pilot 28, Magnum 29, 29SS, 290, Magnum 30D, GTX-30D, 250-15, Tomcat 3000, XR45 and other disc brush models. Many of these machines are offered in a cylindrical brush style. Please check your machine parts manual before ordering. Replaces Factory Cat Tomcat 15-421SS, 29-421SS. Our Part Number FC 15-421SS