Description Perfect for cleaning internal surfaces such as threaded holes or tubes. For use manually or with power drill/driver. Includes (6) brush sizes each in stainless steel, brass,, and nylon bristles for different jobs. All brushes have ¼? hex shaped quick disconnect shanks for easy and quick changes. Set includes: (1) 1/4"quick-disconnect soft grip manual driver handle (1) ¼? quick-disconnect 6? extension adapter for manual driver or power drill/driver. (6) Stainless steel bristle twisted wire tube brushes ¼?, 3/8", ½?, 5/8", ¾?, & 1? diameters (6) Brass bristle twisted wire tube brushes ¼?, 3/8", ½?, 5/8", ¾?, & 1? diameters. (6) Nylon bristle twisted wire tube brushes 1/4?, 3/8", ½?, 5/8", ¾?, & 1? diameter. Set Uses: Stainless Steel Brushes: Stiff and aggressive- use in tough spots for heavy-duty cleaning. Brass Brushes: Less abrasive- will not scratch harder metals Nylon Brushes: Perfect for light-duty cleaning.