AD 56409924 42" 16SR Polypropylene Cylindrical Scrub Brush for Nilfisk Advance 2042, BR 1100C-XL Scrubbers. Durable polypropylene filament for general duty scrubbing jobs on sealed, sensitive or unsealed flooring . .020" bristle diameter is great for general medium duty scrubbing of sealed/painted and unsealed concrete as well as tile, stone, and terrazzo flooring. Equivalent to Poly, Prolene, Polypro. For longer wearing brushes, look for the Nylon brushes (56409941). Fits Nilfisk Advance 2042 Hydro Retriever and BR 1100C-XL riding floor scrubbers. Actual length 40.875". Two cylindrical brushes required. Priced each. Replaces Nilfisk Advance 56409924, 409924.