1. Wide Applicability: This dust cap is suitable for telescopic eyepieces, telephoto zoom eyepieces, astronomical primary mirrors or photographic sockets with M48x0.75 mm dimension threads.2. Protects Lens: This dust cover effectivelyyour telescope lens from dust, dirt, and other potential damage, ensuring clear and uninterrupted viewing.3. M48 Thread: The dust cover is designed with internal threads and can be screwed directly on the thread of the lens interface to protect the lens more firmly.4. Pefect Fit: The mold opening ratio of the dustproof lens cap is 1:1, and the lens cap fits perfectly with the telescope eyepiece to effectively protect the lens.5. Material: Made from aluminum alloy, this dust cover is built to last. It provides long lasting protection for your telescope lens, making it a reliable accessory for any astronomy enthusiast.Specification:Item Type: Telescope Lens Dust CapMaterial: Aluminum AlloyThread Size: M48X0.75mmThread Depth: Approx. 4mm / 0.16inPackageList:1 x Telescope Lens Dust Cap