SmallRig Cage for Sony FX30 / FX3 4183B is designed to protect camera and provide accessory mounting points. The modular cage consists of a Nato rail and a U-shaped cage. The Nato rail is secured on the top via two 1/4"-20 screws and removed to allow installing the original Xlr top handle the U-shaped cage is fixed via 1/4"-20 screws on both sides and at the bottom to prevent twisting, with a cushion against scratches. At the battery door there is a hinge arm that fits camera curve for improved grip experience for little finger.a dedicated Hdmi cable clamp protects interfaces to ensure stable signal transmission.