Have you ever seen a coaxial cable connected to the TV or wall with a black plastic sleeve around the connector? These security sleeves are cylinders approximately 3 inches long and 1 inch in diameter. They spin freely over the "F" connector inside. The purpose is to keep casual occupants from disconnecting the TV set. They are often seen in hotel rooms.
But what if you want to use the TV to review the home movies on your video recorder, or some similar innocuous use? This is the tool that can install and remove a connector with the sleeve, it simply slides into the sleeve like a wrench and turns the F connector inside.
Please, just reconnect and test everything when you're done! Hotels have been known to charge people repair bills.