A drum key having an elongated drum key shaft. The drum key shaft has a non-circular bore at an open end. A longitudinal bore axis of the non-circular bore is preferably aligned with a centerline axis of the drum key shaft. A torquing wing is integrally formed with the drum key shaft. A pair of elongated...http://www.google.fr/patents/US5193418?utm_source=gb-gplus-shareBrevet US5193418 - Drum key
