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A center punch is typically used as an aid to drilling operations; a drill, when brought into contact with a flat surface, will have a tendency to wander on the surface until it gains sufficient purchase to start cutting a hole. A center punch forms a small dimple in which the tip of the drill (if it is small enough) will fit. When drilling larger holes and the web of the drill is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed. A center punch usually has a tip, that when viewed on a profile, has sides at a 90 degree angle to one another. [via wikipedia]
thanks to The Best Things for the photo.
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