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 1/4" hex shaped quick-disconnect shanks for easy and quick changes Set Includes: (1) 1/4" quick-disconnect soft grip manual driver handle (1) 1/4" quick-disconnect 6" extension adapter for manual driver or power drill/driver (6) Stainless steel bristle twisted wire tube brushes 1/4", 3/8", 1/2", 5/8", 3/4" & 1" diameters (6) Brass bristle twisted wire tube brushes 1/4", 3/8", 1/2", 5/8", 3/4" & 1" diameters (6) Nylon bristle twisted wire tube brushes 1/4", 3/8", 1/2", 5/8", 3/4" & 1" diameters 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