The contractor-grade QLT Wire Brushes come in a 28 or 33 gauge tempered steel bristles or a 32 gauge tempered brass bristles. The 28 or 33 gauge tempered steel bristles brushes come with a choice of a scraper attached to the top of the wood block. You also have the choice to get a steel wire brush with the scraper attached. These products can be used to remove semi-dry concrete from tools and forms, remove asbestos, prep a surface, or remove paint. All of these options come in different brush and bristles sizes. Choose the option that best fits your needs.