Product Description Material: Plastic Size: 15*5.5*4cm Color: Black Diameter: 38-43mm M Circle Flat Circle: 34-38.5mm (for 32-50mm Telescope) S Circle Curved Circle: 31-34mm (for astronomy and small aperture telescopes) Two circles superimposed: 26-28mm (for microscope and astronomy) Quantity: 1 piece Package Contents: 1 * Universal Universal Telescope Holder 1. Setup Simply align the eyepiece with the phone camera. It only takes less than 1 minute, connect the phone to the optical instrument and get a clear image. It is an absolute time saver and image catcher. 2. Wide range of applicable eyepieces Universal mobile phone adapter is suitable for eyepieces with outer diameter: 38-43mm, and can be installed on most binoculars, monoculars, telescopes and monoculars, microscopes. 3. Compatible with most mobile phone adapter mounts, suitable for mobile phones of different widths. Compatible with many smartphone models Commonly found in compatible with iPhone, compatible with Samsung, compatible with LG, compatible with Sony, etc. 4. Unique design The phone holder is designed to be rotatable and detachable, which avoids pressing the volume button and power button during use. It also makes it easier to align the phone with the adapter, and you can focus as quickly as possible. 5. Compact high-quality material full size 15*5.5*4cm. It is lightweight and compact for easy carrying and storage. This phone adapter is made of soft but durable rubber and EVA. The purpose is to hold the phone in place and protect it from scratches. compatible with Samsung, compatible with LG, compatible with Sony, etc.