This is a pair of BNC Easy Fit Connectors designed to fit RG58 50 Ohm & RG59 75 Ohm Coaxial Cable
Fitting could not be easier, and we do not think there is an alternative anywhere near as good as these.
The centre pin in the BNC plug is pushed into the center of the coax, and the screw at the side makes contact with earth braid.
Cable should be prepared as per picture (not supplied) RG59 may need outer insulation stripped back to fit into plug.
Connections should be checked for continuity.
Very high quality.