Pixco Aluminum CS or C Mount Lens to M12 All-Metal Lens Adapter Ring The all-metal adapter is designed to fit the lens securely, yet can still be removed easily when not needed. This adapter ring attaches between the lens and the camera and enables an CS Mount Lens to be mounted onto a M12 Board Camera. Compatible with: CS or Cmount lens, M12. Materiel: Aluminum Inside diameter:12mm; Outside diameter:25mm.