This is a simple STL to integrate in your 3D models like a project box or a control panel.

It's a model of a keystone bracket to accomodate standard keystone modules like ethernet or audio jacks.

Just make a 28 x 17.9 mm rectangle hole in your model and align the STL to the hole and the face to the face of your model.

It's super simple and super useful.

PS> Juste realized there are ton of this already... hehe... here's one more... :-)