I think its one of these. Nr 4

It would be part of your nifty fire starting and general drilling kit.
I lived in Botswana for 5 years and had seen both the San and Naru peoples using this technique to drill into ostrich shells to make jewellery.
Here is a link to how it works if you want to start a fire. http://wildernessarena.com/food-water-shelter/firecraft/lighting-a-fire