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
AD-1420 - For use with that size hole (i.e. Sartek Video lights)
AD-5mm - For housing that has a 5mm threaded hole, AD-MOD is shipped with a 5mm bolt
AD-6mm - With a stud for use on Subal housings for spotting light (specify specific housing)
AD-8mm - Used for most European strobes with 8mm threads
