Rotary Brush, Application Polishing, Scrubbing, Fits Machine Size 20 in, Shape Round, Material Nylon, Bristle Material Nylon, Bristle Color White, Brush Diameter 20 in, Trim Length 1 3/4 in, Block Size 20 in, Compatible with Manufacturer Part Number T300, T300e, T350, Bristle Diameter 0.03 in, Compatible with Grainger Part Number 20KR12, Features Will Not Scratch Tile Terrazzo or Coated Surfaces