Galvanized double-stem with single spiral. Indispensable brushes for inside cleaning of arbor holes and difficult finishing jobs on non-ferrous metal and hydraulic castings. Suitable especially for deburring cross drillings, steering parts, O-rings and cylindrical boreholes in many other workpieces. Adaptable for using as a hand tool or mounted in a portable tool for outstanding cost-effctive performance. (Details)