SVBONY phone clamping features adjustable locking mechanism with a steel bolt (not a spring); Phone is protected by High density EVA pads. Works great for the phone in the up and down position taking pictures and recording sideways or in distant;keys capture the best videos of world successfully is practice and patience. Aluminum alloy shell;sturdy durable and lightweight;the phone clamp made of high strength PA plastic and features adjustable locking mechanism with a steel bolt not a spring. Fits eyepiece diameter from 25 to 48mm and 1.25" telescope;not fit 2" eyepieces;compatible with microscope;telescope;binoculars;monocular;spotting scope;night vision monocular and most optical device. 52 to 100mm has been tested compatible with iphone;iphone 5;5s;6;6 plus;7;7plus;Sony;Sony Xperia Z;Samsung Note;Samsung Galaxy S7;Galaxy 7;Galaxy 5;Galaxy Note 5;Samsung Note 4;ECT;Moto G5+ and many other brands.Specific Uses For Product: Bird Watching and Astronomical Observation. Objective Lens Diameter: 25 Millimeters. Special Feature: durable, fully metal. Age Range (Description): Adult. Brand: SVBONY. Country of Origin: China. Manufacturer: SVBONY. Date First Available: August 11, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #16 in Telescope Photo Adapters. Customer Reviews: 3.9 out of 5 stars 858 ratings 3.9 out of 5 stars. Item model number: FAUW2546A. : B01K7M0JEM. Item Weight: 4 ounces. Product Dimensions: 6.3 x 3.94 x 1.97 inches.