This low level column kits are of intermediate length between the standard center columns supplied with tripods and the very short columns previously supplied as separate accessories. Their lengths are defined to achieve the lowest shooting angle with legs not extended but opened to the widest angle. Column kits are in Carbon 6X tube and also incorporate the components for the Gitzo Ground Level Set: machined aluminum Safe Lock upper disc, new reversible screw and new extensible hook. This is the most convenient way to update previous carbon fiber, basalt and aluminum Gitzo tripods to the latest specifications and development.GS1510KB Features:Ground Level Set - This 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.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.Safe Lock - is a special techno polymer that maximises locking torque and equipment stabilisation. It is used on the upper discs of tripods and heads, and in applications where the equipment is rotated and screwed onto the support to eliminate micro movements and vibration.