SMA connectors are used in special situations in fiber optic communication systems. For example, testing equipment, data networks, military instruments, medical equipment, etc. SMA connectors mainly have two different types of material inserts, one is ceramic and the other is metal. In addition to providing common SMA inserts and loose parts, optical communication can also produce metal inserts with different outer diameters and apertures according to customer needs. Optical communication can also provide independent plug-in or integrated SMA connectors,