Product 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 (applies to 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 images. This saves time and helps capture high-quality photos. 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 supports a wide range of phone sizes and fits various models, including iPhone, Samsung, LG, Sony, and other major brands. 4. Unique design. The phone holder is rotatable and adjustable, helping avoid pressing the volume or power buttons during use. It allows quick and precise alignment between the phone and the optical device for fast focusing. 5. Compact and high-quality materials. Measuring 15 x 5.5 x 4 cm, it is lightweight and easy to carry, store, and transport. Made from soft yet durable rubber and EVA, the adapter securely holds your phone in place and helps protect it from scratches.