Feature:1. Matting Treatment: The inner wall of the Telescope adapter rings is subjected to matting treatment to prevent the radiation from affecting the imaging.2. Male to Male Connection: M48X0.75 male thread on one side and M42X0.75 male thread on the other side, male to male connection.3. Seamless Connection: Seamless connection, M42 and M48 accessories can be connected together for a tight connection.4. Aluminum Alloy: Aluminum alloy material, accuracy craftsmanship, durable and corrosion resistant, wear resistant and durable, and long service life.5. Easy to Install: The Telescope adapter is easy to install, it doesn't take much of your time, it is flexible to use, small and portable, and easy to use.Specification:Item Type: M42 Male to M48 Male AdapterMaterial: Aluminum AlloySmall External Thread: M42x0.75mm (T2 Thread)Large External Thread: M48x0.75mmThread Depth: Approx. 4mm / 0.16inFlange Distance: Approx. 2mm / 0.08in.Package List:1 xM42 Male to M48 Male Adapter