Abstract: A drill guide for drilling tubes of a plurality of diameters, the guide comprising at least a first half-body and a second half-body each of which has a first face and a second face that are mutually opposite, which half-bodies are connected together by at least one hinge in such a manner that the two half-bodies can move relative to each other between a first closed position in which the first faces of the half-bodies face each other, and a second closed position in which the second faces of the half-bodies face each other in order to form housings suitable for receiving tubes of different diameters.