The all-metal adapter is designed to fit the lens securely, yet can still be removed easily when not needed. Feature: This adapter ring attaches between the lens and the camera and enables an CS Mount Lens to be mounted onto a M12 Board Camera. Specifications Appearance: Black Materiel: Aluminum Inside diameter:12mm Outside diameter:25mm Compatible with: CS or Cmount lens M12 Package Include: 1x Lens Adapter Suit For CS or C Mount Lens to M12