Suitable for 5 diameters :7mm, 7.7mm, 8mm, 9.5mm, 10mm. One cutter head and spacer sleeve included.
Barrel trimmer is a great tool to make pen barrels true square. Just a little bit of shaving will be fine. The trimmer tip can remove dry glue efficiently.
You can use it by bare hand or drill press, depending on the length you feel like to shave.