Catena antiruggine 1 velocità

   *****      *      *****   *******  ******   ******   
  *     *    * *    *     *       *   *     *  *     *  
  *     *    * *    *     *      *    *     *  *     *  
   ******   *   *    *****      *     ******   ******   
        *   *****   *     *    *      *     *  *     *  
       *   *     *  *     *   *       *     *  *     *  
   ****    *     *   *****   *        ******   ******