Material: Plastic Size: 15 * 5.5 * 4cm Color: Black Caliber: 38-43 mm Flat circle of the M circle: 34-38.5 mm (for 32-50 mm telescope) S-circle curve circle: 31-34 mm (for astronomy and telescopes with small openings) Two circles superimposed: 26-28mm (suitable for microscope and astronomy) Quantity: 1 piece Package Contents: 1 x Universal Telescope Bracket 1. Easy setup: Align the eyepiece with your phone camera quickly. Connect your phone to the optical instrument in under a minute to capture clear images. Saves time and helps capture high-quality visuals. 2. Fits a wide range of eyepieces: The universal phone adapter bracket fits eyepieces with an outer diameter of 38-43 mm. Compatible with most binoculars, monoculars, telescopes, spotting scopes, and microscopes. 3. Compatible with most smartphones: Adjustable clamp fits a wide range of phone sizes. Works with popular models including iPhone, Samsung, LG, Sony, and other major brands. 4. Unique design: Rotatable and adjustable phone holder prevents pressing volume or power buttons. Allows quick alignment between phone and adapter for fast focusing. 5. Compact and durable: Measures 15 x 5.5 x 4 cm. Lightweight and portable for easy storage and transport. Made from soft yet durable rubber and EVA materials to securely hold and protect your phone from scratches.