PB 3315491 14" .035"/180 Mid-Grit Scrub Brush with Lugs for Minuteman Power Boss Floor Scrubbers. Our .035" diameter, 180 grit filament is great for general duty, every day scrubbing tasks on unsealed concrete, sealed concrete, older painted and epoxy painted flooring and most tile and stone surfaces. Much softer than the aggressive .070"/46 grit (3303741) brushes. Long lasting DuPont Tynex-A or Hahls Nylon filaments are impregnated with 180 grit silicon carbide granules and are arranged in a 6 row configuration on a solid plastic molded brush block.. Equivalent to Powergrit 120AGS. Commonly blue in color. Not recommended for painted or epoxy painted flooring. These can be used on older painted flooring. Include 3 drive lugs (arranged around a 5-1/2" center hole). These are the older style scrub brushes used on models including 62, 65, 78, 80 and 82 Series scrubbers. Please check your model before ordering. For the newer Powerdrive style clip-on brushes, use 3332544. Most machines require 3 brushes (4 if using a side scrub brush). Priced each. Replaces Minuteman Power Boss 315491, 3315491. Our Part Number PB 3315491