Feature: 1. Seamless Connection: With a seamless connection, M42 and M48 accessories can be connected together. 2. Thread: One side is M48X0.75 male thread and M42X1 female thread, the other side is M42X0.75 male thread. 3. Premium Materials: Made of aluminum alloy material, accurate craftsmanship, strong, durable and corrosion resistant. 4. Easy Installation: This telescope adapter is easy to install, flexible to use, compact and portable. 5. Matting Treatment: The inner wall is treated with extinction to prevent the radiation from affecting the imaging. Specification: Item Type: Telescope Adapter Ring Material: Aluminum Alloy Large Male Thread Specification: M48x0.75mm Large Male Thread Depth: 6mm Small Male Thread Specification: M42x0.75mm (commonly Known As: T2 Thread) Small Male Thread Depth: 4mm Female Thread Specification: M42x1mm (commonly Known As: M42 Thread) Female Thread Depth: 4.5mm Package List: 1 x Telescope Adapter Ring