I have installed today at our trekking bikes this frame lock with an additional chain, because I handle the cumbersome went for a short shopping stop with a cable lock on my nerves. The installation went smoothly, because the frame had already provided the appropriate threaded holes. Am Schloss make the caps off and the two screws inserted through from the top and bottom matching slots (right and left) and bolted to the frame at the threaded holes - finished. The lock can be operated easily and in conjunction with the extra selling 1 meter chain our bikes are now well secured. A total of 4 keys are provided with which one can use both locks. I would buy this TwinSet immediately.
