The Gitzo Systematic Series 2-4 Carbon Fiber Column has a wide diameter durable structure that preserves the strength of Systematic series 2/3/4 tripods regardless of how high it is set. The "rapid" column operates on a simple twisting mechanism that provides easy sliding within the tripod shoulder. This allows you to move a heavy load up and down in a very short amount of time with minimal effort. The bottom of the column includes a retractable hook that you can attach a counterweight to for extra stability. The Systematic Series 2-4 Carbon Fiber Column includes a safety catch feature that prevents the column from dropping down inadvertently.