The punch is a Poinçon (generally in Acier) which is used to mark the print for a hole to bore.
The punch is always pointed, one should not the step confuse with the Chasse-goupilles). The taper angle can vary.
The operation is carried out on a Marbre: the sand-gravel mix Marking gauge two features on the part, with the intersection, one strikes the punch with a hammer. Then, it is necessary to use the print left by the punch to place the center drill.
The term punch can be also used to indicate a conical component, which with for function to limit the flow (of a fluid). As on this part, there is a Filetage, it is often a screw-punch.
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