FC 15-421C / 29-421C 15" .035"/180 Grit 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. As the name describes, the .035"/180 Tynex-A or Hahls grit scrub brushes can be used for everyday general duty scrubbing on hard surfaces including tile floor. The narrower bristle reaches grout lines. These are commonly used on older sealed or unsealed concrete flooring with light to moderate debris. Usually blue in color. Equivalent to Midi-Grit. Lighter than .065"/46 Heavy Grit and stiffer than Light Grit. Replaces blue or green floor pads. Includes 8-Point clutch plate with spring clip (older model 29's took a six point plate, FC 7-421C. If these 6pt. brushes are needed, please add these to the cart and reference 7-421C-6 in the Special Instructions box at checkout - 6pt brushes pictrued above). Please check your existing brush set up before ordering. 14" diameter block with a 15" scrub path. Commonly listed as a 15" Brush . Most machines require two or three brushes, priced each. These are commonly bundled to reduce shipping costs. Fits Factory Cat Pilot 28, XR-45, 29, 29SS, 290, Magnum 30D, GTX 30D, 250-15, Tomcat 3000 and other models. Many of these scrubbers are offered in a cylindrical brush model. Please check your machine parts manual before ordering. Replaces Factory Cat Tomcat 15-421C, 29-421C. Our Part Number FC 15-421C