and just a little bit more specifications and details about items...
The internal components of these are much different from a standard VHF/UHF barrel connector. The center coax conductor indexes into a close-tolerance tube that is resilient and the close center-tube tolerance assures a tight connection, the plating assures a good electrical connection and the overall performance is greatly improved over standard designs.
Internally, the center conductor tube is insulated from the inner skin of the barrel by a maximum air gap which results in much less RF loss.
Insertion loss is extremely low and not really necessary to consider in complex systems