The AD1 allows fits at the base of an RCA or AEA R44 and KU4 allowing you to connect it to a stand. It has an RCA 1/2″M pipe thread to US 5/8″-27F mic stand adapter.
The AEA locking rings are wide locking rings for 5/8″-27 thread mic adapters and stands in a nickel finish. These locking rings give you more flexibility when tightening mics and mic clips.