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.