Magnesium mounting head which is suitable for different mountigs. Please select yours and you see the price for this. The tripod has included a tray 37 cm and a spread stopper # 51008. You put the tray at the spread stopper and fix it with the black knob. The light magnesium mounting head serves as module basis for 14 different inserts. The module insert can be changed at all times using a special wrench (included in the delivery of the changing module). The fixation in the cone ensures a positive-locking, clearance-free connection of the components. The Astronomy-Tripods Report are with a spreader between the tripod legs and not with the adjuster for different angle as for the Photography-Tripods Report.