Compliable with Binocular, monocular, telescope, microscope, spotting scope, night vision and most optical device. Fit eyepiece diameter 28mm-47mm. Not fit 2inch eyepieces. Universal: With super large width range:54-90mm, Fit iphone 6plus, 6,5s,5, Samsung Note , Sony, Sony Xperia Z and many other brands. Adjustable clamping force -- The phone clamping part features adjustable locking mechanism with a steel bolt (not a spring).This part can separately mounts on any standard tripod (1/4-20). Phone is well protected by High density EVA pads and nothing contacts your phone's screen. Durable metal materials: Mainly made of Aluminum. Part made of high strength PA plastic. One time purchase for long-term use. Note: Please make sure that the outer diameter of the eyepiece is between 28mm-47mm(1.102"-1.850").