The worst part of these plastic gadgets is that you upgrade phones, cases, binoculars and spotters consistently if you are a tech or gear junkie like myself. Having to drop $100 all the time for new pieces is just plain irritating. I finally bought this piece and it is great! I use it on my monarchs, vortex razors, mavens and my Athlon Ares spotter. All of them fit and I can swap pieces with just a twist of the mechanism. One thing that I have done is kept the universal one on my bino's and then still used a preset one for my spotter so that way I can move from optic to optic without having to unscrew or detach anything aside for the phone case. I am very happy to see Phone Skope doing this and not being a money hungry grab for more plastic pieces. Get it and save yourself some cash in the long run.