Product Description This EYSDON cellphone holder connects a cellphone to an astronomical telescope and microscope easily Fit for diameter within 24 to 38mm can use it Adjustable range:fit for most cell phone which the width within 56 to 85mm Durable metal materials:versatile and sturdy;one time purchase for long term use Cellphone clamp with rubber lined:no need worry about your phone is scratched or damaged Color:Black and Silver Package include: 1 x Cellphone adapter Note: Please allow 0-2mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! If you really care about these details, pls DO NOT order. How to correctly use it and make it work better for you Step 1: Attach phone to smartphone adapter firstly Please hold your phone and smartphone adapter from their back;so you can align smartphones lens with the eyepiece easily;meanwhile;please clamp your phone tightly by smartphone adapters two sides;then tighten the screw when they are aligned and tigh Step 2: Attach whole phone and smartphone adapter to telescope If the lens doesn't get close enough;we suggest you adjust the position of eyepiece clamp on the telescope Fit for diameter within 24 to 38mm can use it Adjustable range:fit for most cell phone which the width within 56 to 85mm