Silicone carbide impregnated in nylon bristles is self-replenishing as brush wears, offering unmatched value that outlast floor pad over 100 to 1. That translates directly into time and cost savings. Featuring our water and chemical resistant Tuff-Block® to insure that the block last as long as the bristles for maximum life expectancy. Offers the durability of grit brushes with minimum aggression. For daily scrubbing of a variety of tiles, marble, terrazzo and non-slip epoxy finishes. Trim Length: 1 1/2"; Grit: 500. Bristle Color: Red; Bristle Diameter: .018.