This is a replacement, retractable weight hook for any XC-M 525 aluminum or carbon fiber tripod. It connects to the bottom of the center column and allows you to attach additional weight to the tripod to improve its stability.
It is also a replacement hook for the XC-M 525 Tilting Column Adapter. With the Tilting Column Adapter installed you can add weight to the bottom of the adapter as well as to the bottom of the column. This improves the overall stability of the XC-M525 tripod while also counterbalancing your camera rig.
Additionally, it also works with the XC-M 525 Aluminum and Carbon Fiber Ground Level Adapters.