This is a simple 1x1x5U gridfinity cufflink holder. I wanted one with out a border around the top and with rounded rectangle holes instead of circular ones so it helps keep the cufflinks oriented correctly. I just made this for my cufflinks which both have the same backs. I'm not sure if these are standard or not but hopefully someone else can use them as well. If your cufflink backs look like the ones in the pictures I imagine they will work. Made this to fit cufflinks around 15mm in diameter but should be able to go up to about 18mm without running in to each other and still not touch the outside border of the holder. The hole depth is 29mm