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Versatile Compatibility: Optimized for eyepieces with 25mm-48mm outer diameter; ideal for telescopes, microscopes, binoculars and spotting scopes. Universal phone holder: fits smartphones with a width of 55mm-85mm, including popular brands. Robust construction: Made of solid metal and aluminium, the adapter offers high stability and durability for a safe viewing experience. Humanized Design:With rubber sleeve and EVA material, protect the phone clamp from scratches and damage. EASY ASSEMBLY - Easy to assemble, insert phone, center camera and adjust focus wheel for optimal observation.