Use the smaller hole for 8mm pencils and and the larger for 10mm pencils. For 12mm pencils, simply remove the white circular adapter on the 10mm hole by gently pressing down on the white peg sticking up from the sharpener at the end of the blade.
For a rounded tip, sharpen pencils with the white transformer attached. If you prefer a pointed tip, remove the white transformer.
To clean debris, simply remove the cleaning tool by tugging on the white circular tip under the two sharpener openings. Once you’ve removed the tip, just slide it along the blade and under the transformers to remove any debris.