Often, drill sharpening machines only start from a drill size of 3 mm, as it is not possible to securely clamp drills with a diameter of less than 3 mm in the sharpening machine. Proxxon has considered this and offers an adapter set for spiral drills under 3 mm. The adapters are suitable for spiral drills ranging from 1.5 mm to 3 mm. Drills over 3 mm can then be used in the drill sharpener without an adapter. The adapters come in a small wooden box with a sliding lid, making storage easier.