The collar is formed by rolling up a strip (10). First fastening means formed by a hook (14) projecting radially are located at a first end (10A) of the strip, while second fastening means comprising a retaining element (12) projecting radially and suitable for constituting with said hook to close the...http://www.google.es/patents/US6568043?utm_source=gb-gplus-sharePatente US6568043 - Clamping ring
