Product Description Material: Plastic Size: 15 x 5.5 x 4cm 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 (suitable for astronomy and telescopes with small openings) Two circles superimposed: 26-28mm (suitable for microscopes and astronomy) Quantity: 1 piece Package Contents: 1 Universal Telescope Bracket 1. Easy Alignment: Quickly align your phone camera with the eyepiece. Connecting your phone to the optical instrument takes less than a minute, capturing clear images efficiently. 2. Versatile Compatibility: The universal phone adapter bracket fits eyepieces with an outer diameter of 38-43 mm and can be used with most binoculars, monoculars, telescopes, spotting scopes, and microscopes. 3. Broad Phone Compatibility: This adapter bracket is designed to accommodate a wide range of phone widths, making it compatible with numerous smartphone models, including those from iPhone, Samsung, LG, and Sony. 4. Unique Design: The phone holder is rotatable and adjustable, preventing accidental button presses during use. This design also simplifies phone alignment with the adapter, allowing for quick focusing. 5. Compact and Durable: Measuring 15 x 5.5 x 4cm, the adapter is lightweight, compact, and easy to carry and store. It's constructed from soft yet durable rubber and EVA to securely hold your phone and protect it from scratches.