The KUM AS3 Long Point Sharpener lets you create a particularly long and pointed pencil tip enabling detailed work. 

The 2 compartments are labelled on the sharpener and function as follows 

In step 1, only the wood is sharpened until the lead touches the automatic stop. Further sharpening is not possible.

In step 2, the lead is now precisely shaped. The automatic stop prevents
further sharpening.