Weiler 3/8" Round Power Tube Brush is Ideal for cleaning and deburring smooth or threaded blind holes on aluminum, brass, bronze, cast iron, copper, high-nickel alloys, steel, stainless steel, ceramic and soft tile parts. 1/8" stem diameter for use on corded/cordless hand drill, drill press, drilling machine, CNC/milling/automatic machine. Features a single continuous length of stainless steel stem wire filled with a single spiral of crimped wire for a more flexible brushing action. Weiler offers a comprehensive line of power and hand tube brushes for internal cleaning and deburring applications in tubing, pipe, drilled-and-tapped holes, and machined bores and passages. Due to their twisted-in-wire construction, the use of power tube brushes is limited to low-speed power tools such as drills and drill presses and to CNC and manual machine tools in which the RPM can be precisely programmed or set. In addition, they should not be used in reverse rotation to prevent unraveling of the stem wire. Available in a wide variety of brush configurations and fill materials, Weiler can supply a tube brush for any application.