I am selling the KLICKfix UNIKLIP II adapter for rear carriers. This adapter is used to attach bags to a rear carrier and can be attached directly to the bag. By attaching it to your bag, you can easily attach and detach it from the rear carrier. The sixth photo shows an example of how it is actually attached to a bag. Features: Universal mounting kit that fits most gear racks. Tube diameter is 10-16 mm, gear rack width is 9-16 cm. Lightweight, compact, and environmentally friendly manufacturing. The UniKlip 2 attachment system is ideal for various types of bags. - 16 cm, also compatible with non-parallel gear rack struts. The spring-loaded latch automatically adjusts to the diameter of the rack, allowing you to securely and smoothly attach any accessory. If the rack has a spring clamp, it usually does not need to be removed. This system comes with easy-to-understand assembly instructions and mounting hardware.