I needed to install a keystone RJ45 contact in a 19" rack. It was much easier drilling a 30mm hole, designing and printing this model than to make a proper hole for the keystone contact.
This was made for 4mm thick walls. The model is parmeterized in onshape and available here.
I printed it with ABS. A previous version was printed in PLA, but then the snap hooks broke off.
The author marked this model as their own original creation.