The GH4383QD Series 4 Center Ball Head from Gitzo is an Arca-type compatible ball head that is compatible with Systematic 3, 4, and 5 tripods, has a load capacity of 66 lb, an independent panning lock for 360° rotation, and a height of 4.9". The head weighs 2 lb and has a tungsten disulfide coating to help keep the ball movement smooth while it minimizes sticking and slipping. A screw lock lock tightens down on the included quick-release plate, and a bubble level helps maintain straight horizons in your images. To allow for precise adjustments, a friction control dial is integrated into the large locking knob. Gitzo GH4383QD SpecsHeadHead Type: Ball HeadBase Mount: 3/8"-16 FemaleCamera Mounting Screw: 1/4"-20 MaleQuick Release Plate Type: Arca-TypeNumber of Bubble Levels: 1Friction Control: YesIndependent Pan Lock: YesPan & Tilt RangeLateral Tilt: -90° to +39°Vertical Tilt: 90°Panning Range: 360°GeneralLoad Capacity: 66.1 lb / 30 kgWeight: 2 lb / 900 g