Simple the Lowest loss F-Connector in the world!  

Why buy all your nice new satellite gear and not use the best(?)
This item works because it forces the Satellite Cable into contact with the screw fitting thus cutting down the number of connections that you get with the other metal screw on F-Connectosr and the one connection you do have is as close to perfection as possible
(Never have unnecessary joins in a satellite cable) a video showing how to fit the CAP F connectors can be found here

Sold in Packs of 100