The Kupo G001212 is a universal double-sided, brass baby 5/8" (16mm) stud with 1/4"-20 male thread on one side and a 3/8"-16 on the other. The stud is round and will fit into any 5/8" (16mm) receiver.
In the Box
Kupo Universal 5/8 Inch(16mm) Stud 3/8-16 M and 1/4-20 M