This power pipe cleaner set includes 6 fitting cleaning brushes (2 for each of these sizes: 1/2-, 3/4-, and 1.0-in). They are used to clean pipe fittings with a diameter of 1/2-, 3/4-, and 1.0-inch. The diameters of brushes are slightly bigger than those of fittings to balance cleaning efficiency and friction/durability. The 1/4-inch shank on the brush fits most power drills. Brushes are used at low speeds on power drills (note: not designed for impact drivers). They clean copper, brass, and bronze pipe fittings for subsequent fluxing, soldering, sweating, brazing, or welding. These wire brushes are primarily designed to clean the inside of pipe fittings, but may also be used for other applications, such as cleaning automotive parts, bores, cylinders, tubes, holes, nut threads, etc.; removing rust, corrosion, and paint; surface preparation; fabricating, woodworking, polishing and finishing, etc.. The brush bristles are made with stainless-steel wires for heavy use and effective cleaning. It is a tool set for homeowners, DIYers, plumbers, and contractors, etc.