Product Description Material: Plastic Size: 15 x 5.5 x 4 cm Color: Black Caliber: 38-43 mm Flat circle (M circle): 34-38.5 mm (for 32-50 mm telescopes) S-circle curve circle: 31-34 mm (for astronomy and telescopes with small openings) Two circles superimposed: 26-28 mm (suitable for microscopes and astronomy) Quantity: 1 piece Package Contents: 1 * Universal Telescope Bracket 1. Easy Setup: Easily align the eyepiece with your phone camera. Connecting the phone to the optical instrument and capturing clear pictures takes less than a minute, saving time and capturing images efficiently. 2. Wide Range of Eyepieces: The universal phone adapter bracket fits eyepieces with an outer diameter of 38-43 mm and can be mounted on most binoculars, monoculars, telescopes, spotting scopes, and microscopes. 3. Phone Compatibility: The universal adapter bracket is compatible with a wide range of phone widths, fitting most smartphone models, including iPhone, Samsung, LG, and Sony. 4. Unique Design: The phone holder is rotatable and movable to avoid pressing the volume and power buttons during use. This design also simplifies aligning your phone with the adapter, allowing for quick focusing. 5. Compact and Durable: Measuring 15 x 5.5 x 4 cm, it is lightweight and compact, making it easy to transport and store. The phone adapter is made of soft yet durable rubber and EVA to securely hold your phone and protect it from scratches.