1、Made of good-quality aluminum alloy, solid, durable and corrosion-resistant. 2、Black anodic oxidation treatment surface to prevent unwanted reflections. 3、Support M48x0.75 thread to fit for 2 inch telescope eyepiece and astrophotography filters. 4、Equipped with side clamping screw with brass locking wing screw, prevent accidental slippage and keep telescope safe. 5、Lightweight, small size and portable. Features: 1. Made of good-quality aluminum alloy, solid, durable and corrosion-resistant. 2. Black anodic oxidation treatment surface to prevent unwanted reflections. 3. Support M48x 0.75 thread to fit for 2 inch telescope eyepiece and astrophotography filters. 4. Equipped with side clamping screw with brass locking wing screw, prevent accidental slippage and keep telescope safe. 5. Lightweight, small size and portable. Specifications: Model: M48-2'' Material: Aluminium Alloy Color: Black Applicable: cassegrain telescope Main Lens end: 2 inches internal interface Eyepiece end: 2 inch internal interface Inner Diameter: Approx. 5.2 cm/ 2.05 inch Outer Diameter: Approx. 5.9 cm/ 2.32 inch Packing List: 1 * Telescope Adapter Barrel