This clip can be slipped onto standard 5e DM screen which is 2mm thick in order to have cards displayed creature cards during encounters so players can see the picture and the DM can see the stats on the other side. It also can be used to track initiative. Great way to keep things more organized behind the screen and free up space. Standard cards used are .5mm, this design has a gap of .75mm due to my printer not being able to have such a narrow gap so I made it 30mm long in order to add stability. Due to the size I ended up leaving most settings at default.