I ordered 2 of these so that I could mount some raspberry pis to a home rack. As you would expect these were easy to setup The rack mount comes with 4 boards and a screws. These boards provide front facing hdmi slots for the raspberry pi 4 which is quite handy Although these are meant to specifically be for pi4’s I was able to mount some 3s as well the hdmi off of course does not fit but the mounting screws are located in the same location. The cut outs for the ethernet and usb between the 3 and 4 asker slightly different so it does. It fit properly but it is close enough If I require any further mounts I will be looking for these again