The Benro FPB71 is a fluid pan base adapter that will take your tripod head and give it variable tension and panning abilities. By simply placing the base between your tripod legs and tripod head – you now have a tripod head that can smoothly pan and can do so at different resistances. The pan function can also be locked or unlocked quickly by rotating the pan locking knob clockwise or counterclockwise. The fluid pan base comes with the ability to fit on either ¼-20 or 3/8-16 mounts.