Item Type: Adapter RingMaterial: Aluminum AlloyProduct Color: BlackInternal Thread Depth: Approx. 6mm / 0.2inExternal Thread Depth: Approx. 4mm / 0.2inFlange Distance: Approx. 8mm / 0.3inClear Hole Diameter: Approx. 45mm / 1.8inProduct Weight: Approx. 27g / 1.0ozMount: SCT (M51x1mm), M48x0.75mm .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Adopting aluminum alloy material through precision craftsmanship, it is durable and corrosion resistant. 2The inner wall is treated with extinction processing to prevent the radiation from affecting the imaging. 3It is used to connect the camera to astronomical telescope with stable performance and high reliability, which is a very practical accessory. 4Easy to install and flexible to operate, which can effectively save your time and efforts. 5Light in weight, it will not burden your device when using it, and it can protect your camera.