Calumet CK7046 Pro-D Series Ball Head Quick Release Mount Adjustable Drag Control 360&deg; Precision Panning with Built in Spirit Level Pro-D Series Ball Heads are made of the highest-grade materials to provide years of dependable performance. Includes 1/4"-20 mount on quick-release plate Maximum Load Capacity: 13 lbs Adjustable drag control knob. 360 panning movement with calibrated precision Independent pan and ball locking knobs. Built-in spirit level for quick, accurate setups