1、Perfect Fit for Telescope Eyepiece: The telescope dust cap is designed to fit 1:1 with the lens of the telescope, providing effective protection for the lens. 2、Internal Threaded Design: The dust cover is equipped with internal threads, allowing it to be directly screwed onto the lens interface thread, ensuring a secure and reliable lens protection. 3、Compatible with M48x0.75 Size: The dust cap is suitable for use with telescopes or photographic sockets that have M48 external thread dimensions, ensuring versatility and compatibility with various equipment. 4、Aluminum Alloy Construction: Made of durable and lightweight aluminum alloy, the dust cap is not only sturdy but also easy to use, providing long lasting protection for your telescope lens. 5、Easy to Use: The telescope lens dust cap is designed for user convenience, allowing for easy installation and removal. It offers a hassle free way to ensure the cleanliness.