The Cal-Van Tools Double Tube Deburr Tool, No. 169, is designed to work on both I.D. and O.D. of cut lines to remove burrs when performing secondary operations to tubes. This tools works on soft steel or copper tubing. The Double Tube Deburr Tool is made with an aluminum body to hold up in a shop environment. This two-in-one tool is easy to use and features a retractable blade for safe storage. The tool has an internal size range of 3mm-12mm and an external size range of 4mm-14mm.