I always called them 'couplers'. They have saved me a few times too. When I was in the thick of IT, I used to carry a little tool kit with push down-tools for

I always called them 'couplers'. They have saved me a few times too. When I was in the thick of IT, I used to carry a little tool kit with push down-tools for patch panels, screwdrivers, and an rj45 crimper. I carried it for years but only used it a handful of time, mostly on network wall sockets that hadn't been pushed down fully. My geekiest item was a zip up case with my usb flash drives, with the usual Linux distros + Kali, Windows installers and of course Hirens boot USB (and cd!). Hirens was mostly just for resetting local admin passwords, but the disk recovery stuff was useful too. I think I would be viewed with some suspicion carrying that in my new workplace!