This is a "C" to "CS" mount lens black-aluminum adapter for all types of CC.TV camera.
A 25mm Adapter Ring attaches between lens and camera and converts a C-Mount Lens for use on a CS-Mount Camera.
If you have CS mount on your camera and you have lens with C mount, you need the adapter to put between lens and camera.
Extension Tube Converter Ring for Microscope Camera
C-CS Mount Adapter Ring
1 x 25MM C-CS Mount Lens Adapter Ring