The 70mm Wooden Camera WC-151300 Safety NATO Accessory Rail attaches to your camera or other device using any two 1/4"-20 holes up to 1.7" apart on-center, enabling you to mount NATO handles, clamps, and other accessories (not included) onto your camera. The spring-loaded pin on each end of the rail prevents accidental accessory detachment. It is compatible with RED and third-party NATO-style accessories.