In the product description says, "firm fixation - vibration tested", but it can be no question. In my copy of the latching was weak and slightly shaken to dissolve again. There are no additional security. However, near the fixation is an eye whose function is not explained and for which there was no provision. It could thus tie up, but beautiful and functional is not. A small enclosed list asks the seller to send a mail, but failed to name an email address. Return and refund worked flawlessly (for the period).
