Advantages and Features:【Low Gravity Center Design】Low profile ball head design creates stronger locking power and higher steadiness The gravity middle of the ball head is decreased 15% to enhance steadiness CNC machining and 40mm broad ball diameter also make it ultra stable【Double Panoramic Structure】There are two rotating pans in this ball head, either one of them may help the digicam rotate within 360 diploma in different directions It is more smoothly to take panoramic images on rough terrain than ordinary ball head!【Excellent Quality】High density aviation Aluminum-Alloy material, CNC Precision machining, Anodized Surface, make this ball head have unheard of exquisite floor and intensely mushy operation, you may fall in love with it【Great Loading Capacity】QB40 Low Profile Ball Head adopts 40mm diameter extensive ball design, weights Only 0/0, but gives 44lbs /20kg loading capacity【Wide Compatibility】Quick launch plate of Arca-Swiss specification can be utilized on most different ball head Standard 1/4 inch screw on the quick release plate is suitable for DSLR cameras and camcorders, 3/8 inch screw feminine thread on its backside is for connecting with tripod, monopod, slider and other stands list:Main body of PB35/PB40 ball head *1, quick release plate*1 PB35 head PB40 head