A device for protecting motor-vehicles against theft comprising a freely rotatable sleeve covering the polygonal head of a wheel nut or screw, into which sleeve a cylinder lock engages rotatably, which lock is provided with at least one tumbler entering the inner wall of a cylinder lock location cavity...http://www.google.es/patents/US4856307?utm_source=gb-gplus-sharePatente US4856307 - Device for protecting motor-vehicle wheels against theft
Device for protecting motor-vehicle wheels against theft
