SUNWAYFOTO FB-36II 40lb Max load Tripod Ball Head Arca Compatible Sunway FB36II Features DDC-42L Long Handled 42mm Screw Knob Clamp. Accepts QR's from RRS Wimberley, Arca Swiss, Kirk, Markins, etc. 40lb Max load Elliptical Ball for progressive resistance Weighs: 310g (10.8 oz)