PB 3315490 14" .030" Poly Scrub Brush with Lugs for Power Boss Scrubbers. Medium polypropylene brushes for general duty scrubbing of most surfaces including sealed or polished concrete flooring, painted and epoxy painted flooring and sealed or painted concrete flooring with light debris. These disc brushes can also be used on tile, stone, terrazzo and other stone surfaces. Will not damage older painted or epoxy painted flooring surfaces. Poly brushes do not wear as long as nylon. Commonly black in color. 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 3313135, .030" Nylon. Most machines require 3 brushes (4 if using a side scrub brush). Priced each. Replaces Minuteman / Power Boss 3315490