It is made of aluminum alloy and features one knobs to control the horizontal and socket ball adjustment, Portable and affordable. A removable quick-release plate is suitable for cameras with 1/4" screw. High precise ball design, no effect for shooting just because of the adjustment of angle. Single control knobs, adjust different rotation angle. Two levels for both horizontal and vertical shooting to meet your angle adjustment demands.  Ball head diameter is 30mm Specifications Brand QZSD Model Q01 Diameter 30mm Load Bearing 8KG Product Weight 290g(include plate) Package Size 20L x 15W x 15H cm Package 1 x Ball Head, 1 x Quick Release Plate