I'm going to take a guess at TV coax, based on the shape and size, and the fact that this seems to be the entry point for the hone line and cable TV wiring.
Probably a DIY effort to feed a bedroom TV from the main cable box....?
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local