The Celestron NexYZ fits any eyepiece from 35mm to 60mm in diameter including telescopes with 1.
25"" and 2"" eyepieces, spotting scopes, monoculars, and binoculars.
It will also attach to microscopes with the addition of the included adapter ring, which takes the usable diameter down to 25mm, the size of a standard microscope eyepiece.