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Known_Visual_3210 posted on r/whatsthistool1w
Back before TV channels were encrypted you could hook up your antenna feed to the cables distro block and get free cable, the cylinder to the left is a device that connected to their distro block and the house antenna feed was connected to the threaded part. the cylinder spun so that the cable connection was basically locked, the tool on the right removed the lock. They were also used on cable demarc boxes to lock the box. https://www.amazon.com/iMega-Cable-Locking-Terminator-Tool-7/dp/B09RQDDLKN