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. Easily align the eyepiece with your phone camera. It takes less than 1 minute to connect the phone to the optical instrument and capture clear pictures. This adapter saves time and helps capture sharp images. 2. Fits a wide range of eyepieces. The universal phone adapter bracket is designed for eyepieces with an outer diameter of 38-43 mm and is compatible with most binoculars, monoculars, telescopes, spotting scopes, and microscopes. 3. Compatible with most smartphones. The adapter fits a wide range of phone widths and works with popular models including iPhone, Samsung, LG, Sony, and other major brands. 4. Unique design allows rotation and adjustment to avoid pressing volume or power buttons during use. The movable holder makes it easy to align your phone with the optical device for quick focusing. 5. Compact and made from high-quality materials. Measuring 15 x 5.5 x 4 cm, this lightweight adapter is easy to carry and store. Constructed with soft yet durable rubber and EVA material to securely hold your phone and protect it from scratches.