New answers tagged tools
The tool has two purposes. As a punch, it acts as a large needle. You can use it to sew leather or canvas, as mentioned in the other answers. Punch the tool through your fabric, put thread through the hole, retract the tool, repeat. As a reamer, the non-uniform blade shape allows you to make quite good circular holes in plastic or wood. Punch the tool ...
That is a "punch/reamer". It allows your to repair leather (for example). You thread a thread of something though the hole and then use the sharp end to punch/push the thread though leather. In this way you can repair boots, etc.
It is a "reamer with sewing eye", according to the Victorinox Swiss Army Knife Manual (PDF). It is used for punching holes in leather or canvas and can also used to get a thread through the hole, according to SAKWiki
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