This is an RGBlue rotation ring adapter. There are two sets of micro YS adapters, one of which has been modified for use with a standard-sized YS adapter. For use with genuine twin lights, please use the unmodified set. While it may seem to be exclusively for twin lights, it can also connect to lights from other companies with a little modification. The second photo shows an example of use. Please note that the product only includes the adapter shown in the first photo. Please be aware that this is a used item before purchasing.