This model allows you to insert a SC or LC connector into a keystone hole.
Other keystone converters (not by me)
* [USB Type A female](https://www.thingiverse.com/thing:1349174)
* [COAX](https://www.thingiverse.com/thing:3365440)
* [Blank](https://www.thingiverse.com/thing:373467)
See also (made by me):
* Between-tables-rack-mount
* Power distribution box
* LAN-party cable management