Since the saddle purchase no "cock" (the term was to me so far unknown) was there and the saddle just a frame 2 metal braces bring itself at the bottom, I bought this Selle Royal Kloben to the saddle on the support (vertical pipe) of the bicycle ever be able to fix. The clamp is first inserted into the saddle rails and tightened. Then the saddle clamp can then be inserted and fixed on the seatpost. The saddle securely holds. The SR saddle clamp makes a durable impression. It is suitable only for saddles with wide-spaced seat stays on the bottom.