Description: 【Construction】: Crafted from a single piece of quality aluminum, this dust cap provides robust protection for your valuable lenses and telescope accessories, offering durability compared to standard plastic caps 【M54x0.75mm Female Threading】: Engineered to fit securely on any male M54x0.75mm threaded accessory, such as focusers, field flatteners, or camera adapters. Please verify your equipment's thread size before purchasing to ensure fit 【Secure Stable Fit】: Features a generous 7mm thread depth for a deep and secure connection, preventing the cap from accidentally loosening or falling off during transport 【Easy to Find Design】: The bright red finish not only adds a professional look to your kit but also makes the cap high visible. Easily find it in your accessory case or in the dark during nighttime observing 【Compact and Universal】: With dimensions of 5.7cmx5.7cmx1cm/2.24inchx2.24inchx0.39inch, this Thread Dust Cover is a essential accessory for any astronomer or photographer Specification:     Size Chart: 5.7cmx5.7cmx1cm/2.24inchx2.24inchx0.39inch Thread M54x0.75mm Thread Depth 0.7cm/0.28inch Package Includes: 1 Telescope Dust Cap Note: 1. Please allow slightly error due to manual measurement.