Maryland Brush Company a division of Felton brushes has designed and constructed the Chucktuft Brush to give maximum performance in power-driven tools, where hard working side action is needed, in small area, and for deburring internal bores and threads in metallic and non-metallic parts. Chucktuft brushes can be used on drill presses, lathes, bench grinders, special equipment and portable tools. They are equally effective in conventional chucks or adapted to special mountings. High grade USA stainless steel wire, ideal for non-contamination on SS material. NOTE: The inside diameter of the flue is approximately 1/4" smaller than the outside diameter. The diameter of the flue brush will equal the inside diameter of the flue.