SmallRig 1/4in to 3/8in Screw Adapter (5 pcs) 1610

Thread Adapter with female 1/4″ thread to male 3/8″ thread. It works with our Double Head Stud w/ 1/4″ to 3/8″ thread, and make it work as a Double head stud w/ 3/8″ to 3/8″ thread.