Kupo KS-053 3/8"-16 to 1/4"-20 Reducer Bushing Adapter (5 Pack)

The Kupo KS-053 3/8"-16 to 1/4"-20 Reducer Bushing Adapter (5 Pack) is a hollow 3/8" screw. On the outside, it has a male 3/8" thread. On the inside, you'll find a female 1/4" thread. It works with the Kupo 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.