Feature:1. Using aluminum alloy material through craftsmanship, it is durable and corrosion resistant.2. The inner wall is treated with extinction processing to prevent the radiation from affecting the imaging.3. Used to connect the camera to astronomical telescope, it has stable performance and high reliability, which is a very practical accessory.4. Easy to install and flexible to operate, it can effectively save your time and efforts.5. Light in weight, it will not burden your device when using it, and it can protect your camera.Specification:Item Type: Adapter RingMaterial: Aluminum AlloyProduct Color: BlackInner Hole Diameter: Approx. 38mm / 1.5inFlange Distance: Approx. 2mm / 0.1inProduct Weight: Approx. 17g / 0.6ozMount: SCT, T2(M42x0.75mm) Package List:1 x Adapter Ring