Made of magnesium aluminum alloy, equipped with professional 1/4'' and 3/8'' screw, compatible with tripods have 3/8'' screw. The tube diameter is 25mm and the tube length is 300mm.,Sturdy aluminum construction and locking system,which can ensure 5KG(11.02 Ibs) load capacity.,Adjust the shooting angle freely, allows you to move the center column from 0 to 180 degree angles in various vertical and horizontal positions.,Spiral knob locking system makes the operation easier and quicker.,Install the base to tripod and then install ball head or a camera to the center column.