Benro B0 professional ball head offers separate drag adjustment and lock knobs, for a dual action design. Magnesium alloy components insure even greater performance and lighter weight. Specifications Top Plate or Base Plate Diameter 2in Maximum Load 17.6lbs Product or Folded Height 3.5in Leg Size 0 & 1 Head Mount 1/4-20 Quick release Type Arca-Swiss Style (PU50) Weight 0.6lbs / 0.27kg