Calumet CK7048 Pro-D Series Ball Head Quick Release Mount Adjustable Drag Control 360&deg; Precision Panning with Built in Spirit Level for Solid Camera Support and Fluid Movements Pro-D Series Ball Heads are made of the highest-grade materials to provide years of dependable performance. 360 panning movement with calibrated precision. Simply place the camera on top of the head and it just snaps into the plate groove. You get a click sound and its locked in, it's not going anywhere. No need to screw, unscrew or slide to get you camera back onto the tripod. The tension knobs are great and keep the camera in place. Maximum Load Capacity: 26 lbs - Built-in spirit level for quick, accurate setups. Independent pan and ball locking knobs. Adjustable drag control knob