No problem, strong durable hard plastic, adjustment knobs work well, easy to adjust. Fits my iPhone XS with or without the Otter Box. Lots of settings, doesn't interfere with phone buttons etc. The eyepiece fits the Swarovski STS 20 x 60 x 80mm spotting scope. Also suitable for Zeiss FL STR 20 x 60 x 85 mm spotting scope, no problem, many settings. It also seems to fit my Vortex Viper 10x42 and Leica Geovid 10x42 binoculars but is really near the end of the setup. Probably, will not work with small binocular eyecups, you should get a smaller Gosky adapter in this case. Some reviews said it's too bulky, not too bad for what it's for! I also have a Nova Grade adapter. Also works great, great workmanship, great material, everything is very finely made but "very expensive" compared to the Groski. I wouldn't buy Nova Grade if I bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! not too bad for what it's good for! I also have a Nova Grade adapter. Also works great, great workmanship, great material, everything is very finely made but "very expensive" compared to the Groski. I wouldn't buy Nova Grade if I bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! not too bad for what it's good for! I also have a Nova Grade adapter. Also works great, great workmanship, great material, everything is very finely made but "very expensive" compared to the Groski. I wouldn't buy Nova Grade if I bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35! if I had bought Goski first! It works great for $35!
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