25MM Adapter Ring attaches between lens and camera and converts a C-Mount Lens for use on a CS-Mount Camera. C mount to CS mount lens adapter converter ring. Feature: 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. Specification: Material: Aluminium Size: 25MM Extension Tube Converter Ring for Microscope Camera Transition: 1cm=10mm=0.39inch C-CS Mount Adapter Ring Package Include: 1 x 25MM C-CS Mount Lens Adapter Ring