An important step in pen making requires the brass tube and pen blank to be milled perfectly square, and just as important, all glue residue should be removed from the tube before proceeding. The Universal Barrel Trimmer is by far the easiest way to do this. This set contains 4 pilot shafts to suit most pen kits and tubes, plus a heavy cutter head for squaring the blank. Featuring 7 mm, 8 mm, 3/8", and 10 mm pilot shafts and a 3/4" squaring cutter, compatible with many different pen kits.