Ideal if you want to run in an extension to your Sky, Sky+, FreeSat, FreeSat+ etc installation.
F-connectors aren't generally waffled about like many other connectors - you'll struggle to find 'gold plated' or 'oxygen free' F-connectors and that's because they just work. They may be fiddly and a bit awkward to connect, but once screwed home they stay there, and that goes for these couplers as well.
The panel mounting nut is useful if you want to make a more permanent installation as simple drilling a hole in a panel will allow you to create a tidy back to back connection through panelling or a CTP type connection panel.