rj45 dust cover and blockout device 100-pack - protects network jack, cap ethernet port, switch interface, keystone wall plate g7 power <br> <b> solves these problems: </b><br> 1. control where users connect without the hassle of keyed plugs – easy to remove with needle nose pliers, but nearly impossible without. note: all plugs, including keyed plugs, only serve to keep honest people honest, not to prevent intrusion. <br> 2. dust caps that fall out – uses a true keystone snap-in clip to stay secure. port contacts individually insulated at >500mω. <br> 3. identify dead ports - use to identify switch/router/server ports that do not work. prevents troubleshooting the same problem twice. <br><br> as a 20-year veteran in telecommunications, i have used many types of port blocks and labeling techniques. my goal with this product is to provide a simple solution that works.