Used as an indispensable tool for quick rebalancing. Outline the pink and white, then let the wider part work in to remove the desired part of product. Inverted sides change the angle of your wrist and allow for a precise fit.
Best used at 15,000-20,000 rpm with an Erica ATA electric file. The RPM will vary depending on the technique, the electronic file and the novelty of the bit.