At first glance, this optional GIVI kit consists of a bunch of separate items, but used properly (and together), it provides a nice rapid-release for the ONE FIT PLO__ side case holders.
Specifically: you can mount these ONE FIT side case racks onto your bike as a permanent addition, and hang the desired cases from them at regular intervals, or - and this is the point - you use this kit together with your ONE FIT PLO__ case rack, and 'rapidly' make your bike case- and case-rack free again.
That is what this optional GIVI kit is for.