Tram 1295 NMO to 3/8 x 24 Threaded Adapter. This a Heavy-Duty adapter that converts any NMO antenna mount to a 3/8" x 24 Stud. Ideal for using one NMO connector for multiple antenna types or for converting existing NMO mounts. Rugged black plastic with chrome base actually looks like part of the antenna and not an adapter.