310142  SMA female to BNC female. 

Designed to work with  portable radios that use a removeable antenna with SMA femael connector, this adaptor has a rebated flange around the SMA connector. The rebate allows the adaptor to clear the mounting nut for the connector on the radio. The flange offers stability to the connection and lessens the risk of damage from side force on the radios SMA connector. 

Fits a wide range of Baofeng and Quanshen radios.

The BNC connector makes it easier to connect and disconnect an external antenna .