SUNWAYFOTO brand Arca-Swiss compatible.Low profile Tripod Ballhead XB-44.Low Center of Gravity.Very versatile Jaw opening range of 37.25mm to 41.5mm will accommodate any Arca style plate from various makers including:Really right stuff (RRS), Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises,Markins, etc. 88lb Max load!Eliptical Ball for progressive resistance. Y-axis diameter 0.03mm longer than the X-axis. Two drop notch design. One for portrait, one for tilting. Super Stong shell. All Metal knobs. For long term durability. 50mm clamp w Bubble Level. Main Lock Knob Scale Ring.Laser-engraved with index marks. Pan Lock Knob and Panning Base ScaleIndependent Pan Lock Knob, 360° panning movement with calibrated precision, precisely capture overlapping panoramic images. Panning Base is laser-engraved with index marks in 5° increments. Ball Diameter: 44mm. Base: 58mm. Height: 79mm. Weight: 483g.Max load: 40kg (88 lbs). Bottom thread: 3/8" with included 1/4" adapter.Compatible with all Arca Swiss plates.