This rack is made for the Apple mac mini M4 model, the one released october 2024. It is made for 19inch rack and require 2U in height. We use injection molded PC/ABS plastic front panels which is very strong and has great surface finish. We then use 3D printed rear arms with perfect fit around the mac mini M4. This kit comes as standard with 1x RJ45 CAT6 ethernet keystone(female-female) for each mac mini M4 so you can connect from the front to the rear ethernet port on the back. Notice when ordering 3pcs mac mini M4 no keystones are included(no space for them)