This comes in a couple pieces:

• A connector that snaps to A1
• A "knob" that connects to the above Snap-On connector and starts the "chain" of knobs and sockets.
• A number of "links" (knob/socket connectors)
• A socket camera mount (uses the standard 1/4" bolt connector)
  NOTE: The camera connector is printed plastic. Do not overtighten or it will break off in your camera.

Enjoy！