This is a 55mm thread to a T-mount (42mm) thread adapter. It allows all 55mm threaded cameras to be used with telescope and spotting scopes, through the use of a scope T-adapter. Most scope to T-adapters are available through the scope manufacturer.
Does this have FEMALE 52mm threads and MALE t-mount threads, so that it would screw INTO a female t-mount? If you have any other pictures of the actual item it would be immensely helpful. Thanks!