Optical rail is the most common fixed base for coaxial optical path, and it is also a reliable choice for fast building a coaxial optical system. The optical rail with dovetail structure is light and thin, and can be fixed on the optical table or optical breadboard, or add a hard polymer pad underneath to provide firm support. Its perfect streamlined appearance can be tightly engaged with the rail carrier, and the carrier can be easily installed and disassembled without disturbing the rest of the system. Its surface has been treated with a matte finish, which is beautiful and durable.