Floor Machine Brush Application Scrubbing Fits Machine Size 13 in Shape Cylindrical Material Polypropylene Bristle Material Nylon Bristle Color Black Brush Diameter 12 in Trim Length 1 in Block Size 7 in Compatible with Manufacturer Part Number BR 13/1 MW BR 18/1 MW BR 9/1 MW Features Brushes are Designed to Be Attached to Floor Machines and Used to Strip Polish or Buff a Hard Flooring Surface