Mount a 15mm accessory onto a 12mm rod clamp with this 12 to 15mm Rod Clamp Adapter from SmallRig. The aluminum adapter rod measures 4.7" in length and features a contoured design with a 15mm rod diameter on one end and a 12mm rod diameter on the other end. This works well when mounting a follow focus or other accessory when using a 12mm rod clamp, such as the one on the DJI Ronin gimbal. The ends feature M12 threads to extend the rod with optional adapters and rods.