1、Special Design: The telescope finderscope bracket comes with two large thumb locks, including two M4 screws, ensuring smoother surfaces and precise orbital cuts, 2、Aluminum Alloy Material: Finder scope mounting bracket is made of high quality aluminum alloy, which is rust proof, strong and durable, 3、Easy to Use: The aluminum alloy finderscope mounting is easy to use and allows you to mount a telescope guide on your telescope. 4、Wide Compatibility: The finderscope base is ideal for custom mounting a viewfinder on any telescope with a wide range of compatibility. 5、Scope of Use: Universal dovetail base is suitable for C8/C8HD/C925/C11HD, for SKY ROVER 80ED/102ED/130APO/100ED binoculars and other primary mirrors. 1 x Finderscope Base Item Type: Finderscope BaseMaterial: Aluminum AlloyTop Edge:Approx. 23.4mm / 0.9inMiddle Edge:Approx. 34mm / 1.3inSlot Edge:Approx. 9mm / 0.4inBottom Edge:Approx. 34mm / 1.3inScrew: M4 Thread (Approx. 10mm / 0.4in Length)