Weiler 3/4" Double Stem, Double Spiral Power Tube Brush is Ideal for aggressive cleaning and deburring on on steel, armored steel, cast iron, ductile iron and tool steel parts. 1/4" stem diameter for use on CNC/milling/automatic machine, drill, drill press, corded/cordless hand drill or cordless screwdriver. Features four stem wires and a double spiral of straight wire fill material. 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.