NMO Bulkhead with UHF Female Connector allows quick linking and removal of the antenna cable between your radio and antenna, offering additional mounting options for places that require thicker mounts, like roofs. The 3/4in height suits almost every vehicle and serves all race cars especially. With the NMO-Bulkhead, there's no need for a soldered or permanently installed NMO cable to finish your radio connection. The adapter comes with a 5/8in mounting hole diameter. If a cable ever gets damaged, it can be easily replaced and re-attached to the NMO Bulkhead. This product also reduces cable clutter in applications with infrequent radio usage like chase trucks. Compatible with Male-to-Male end coax cable: NMO-RACE-12C.