Hook - This built-in accessory allows you to hang a stabilizingweight (e.g. a full camera bag or a sand/water bag) fromthe bottom of the tripod center column. Useful with longheavy lenses, on uneven ground or in windy conditions. , G-Lock - G-Lock is the new Gitzo leg locking system. The locking mechanism has been completely redesigned in order to achieve a 20% increase in rigidity, faster operation and stronger, safer locking. G-Lock's special design also provides a “gravity lock” effect: the higher the load applied vertically to the leg, the stronger the lock. , Power Disc - The new tripod upper disc is called “Power Disc”. It is made of machined solid aluminum and it now features two locking screws, one to lock the head, the other to safely lock the disc onto the column. The “Power Disc” gives a rock solid connection of the whole system for additional safety and stability. , Leg EndsAll tripods and monopods in Series 1 and above are provided with removable rubber feet. This feature allows you to easily change worn out rubber feet or to fit other accessories, such as spiked feet or snow/sand shoes. (4 sections tripods in Series 1 are excluded because the final leg section is too narrow to fit these ends). , Reversible Column - The rapid column can easily be inverted for an alternative shooting angle or low level macro work. , Rapid Column - The center column locking collar above the tripod shoulder makes it easier to adjust the column quickly. Series 1 and above are built with an anti-rotation grooved center column for improved stability. , Ground Level Set - This new feature allows you to remove the center column to save weight and get the camera closer to the ground. Uses existing components: the upper disc with reversible 1/4 - 3/8 bolt and the column hook assembly: Remove column and fix the disk directly to the upper casting using the column hook. No tools needed.