This is a 9 pack of plastic SMA thread protectors /caps/ covers. They just protect the male threaded part of a radio device when an antenna is not connected and keep the connector from breaking loose of the board if threaded flush to the device. They also just look nice. Good for FPV drone gear, handhelds, Meshtastic stuff, radios, etc that use the SMA standard. They are 14mm in diameter and 10mm tall or .55" in diameter and .4" tall.
