An adapter (made of two pieces) to attach a smart phone to a pair of binoculars - for the purpose of picture-taking (also known as digiscoping!). Many adapters exist for spotting scopes, but there are few for binoculars.
The particular STL files uploaded should work for a Nikon Monarch ATB 8x42 binoculars and a Google Pixel 1st gen. However, the Solidworks files attached are easily modifiable to support any style of binocular or phone. In the future, I'll be updating this page with more .stl files for each type of binocular