Heavy-duty polypropylene bristles resist stains and odors and are designed for use in the most demanding industrial applications. Reliability for those industrial-strength jobs. Two-threaded handle holes on either side of block for even wear. Coarse polypropylene and polystyrene bristles can be used indoors or outdoors to remove heavy dirt and debris from rough surfaces. Plastic structural foam block resists cracking warping and bacteria growth. Angle brace adds support and stability