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1. Wide Applications: Works with all types of telescopes, mirrors, refractors, for Dobsonians, for Mak Cas and for , all you need to do is measure your telescope tube size and choose the appropriate mask size.2. Good Functions: The mask takes the guesswork out of focusing and even overcomes conditions to give your telescope the best focus quickly and easily.3. Metal Posts: The mask grips the telescope tube gently and firmly with three metal posts. These metal posts come with scratch silicone covers to your telescope . This prevents slippage while keeping the mask perfectly centered.4. Post Installation and Lightweight Design: Thanks to this 3 post mount, the mask remains centered while fitting a wider range of telescopes. The bahtinov focus mask for telescopes is lightweight so you won't upset the balance of the scope.5. Applicable Size: The outer diameter of the bahtinov mask supports the telescope objective lens in the range of 120 to 160mm (there is a 1‑2mm error in manual measurement).Spec:Item Type: Telescope Focus MaskMaterial: AcrylicThickness: Approx. 2mm / 0.08inColor: As Pictures ShownWeight: Approx. 46g / 1.6ozThe Outer Diameter Size Range of the Telescope Objective Lens Is Supported: Approx. 120-160mm / 4.7-6.3in (there is an error of 1-2mm in manual measurement)packing list:1 x Bahtinov Mask3 x Mounting Accessories GOOD FUNCTIONS: The mask takes the guesswork out of focusing and even overcomes conditions to give your telescope the best focus quickly and easily. Wide Applications: Works with all types of telescopes, mirrors, refractors, for Dobsonians, for Mak Cas and for , all you need to do is measure your telescope tube size and choose the appropriate mask size. Applicable Size: The outer diameter of the bahtinov mask supports the telescope objective lens in the range of 120 to 160mm (there is a 1‑2mm error in manual measurement). 【Applicable】: Telescope plate is suitable for different telescopes, such as mirrors, refractors, for Dobsonians, for Mak Cas, for , you just need to measure the size of the telescope tube. The outer diameter of the mask supports the telescope objective lens in the range of 120‑160mm (there is a 1‑2mm error in manual measurement). Metal Posts: The mask grips the telescope tube gently and firmly with three metal posts. These metal posts come with scratch silicone covers to your telescope . This prevents slippage while keeping the mask perfectly centered. ASIN B0CST8YBCB Brand Yctze Model Name Yctzehoznf9curx Manufacturer Yctze Model Number Yctzehoznf9curx Item Type Name Reflectors Manufacturer Part Number Yctzehoznf9curx Item Dimensions D x W x H 6.69 D x 6.29 W x 0.39 H