SmallRig Articulating Arm 2071 includes a ballhead with 1/4'' screw, a ballhead with NATO clamp and a ballhead clamp. It enables additional attachment for your options as per your needs and different shooting scenarios. For example, it could attach plate with 1/4''-20 threaded holes or cage with 1/4''-20 threaded holes on the one end via ballhead with 1/4'' screw, while it could also attach monitor cage with NATO rail with on the other end via ballhead with NATO clamp.