This is the quick-release clip for the OpenPilot CopterControl and CC3D cases. You also need the bottom part and the top part for the board of your choice. Note that you can order multiple clips to enable easy transfer of a board between different frames. More info here: http://wiki.openpilot.org/display/Doc/CopterControl+case and http://wiki.openpilot.org/display/Doc/CC3D+Case
This is the bottom part of the OpenPilot CopterControl case. You also need the top part (Case upper v1) and (optionally) the base (Case base 1 v1). More info here: http://wiki.openpilot.org/display/Doc/CopterControl+case
IMPORTANT NOTE: Due to some very slight dimensional differences, this case needs some minor modifications with a knife/file to fit the CC3D. A separate version is available for the CC3D.
Bits and pieces for multirotors, especially OpenPilot CopterControl