The Kupo KS-051 Adapter Spigot from KUPO is a male 1/4″-20 to male 1/4″-20 adapter that allows two pieces of equipment that have female 1/4″-20 threads to be connected to each other with Hex nut center for tightening.
Specifications:
Dual male stud with standard 1/4″ 20 tripod thread