These adapters are all the same, they just have different size threaded holes in them. These threads will take a stud or bolt. Always specify your specific use when inquiring about universal adapters.
AD-3816
For use on Ikelite handles (old style), Ultralight trays, or Nikonos trays
If you
don't see your application or size listed, we can likely supply it. Specify
female threads or the type of male threads you need. (i.e. bolt or stud and
the length needed). These adapters can be used as base adapters on trays,
strobe adapters or adapters for anything that needs a ball at the end.