This attaches to the ARRI rosette on the side of the camera and provides a 15mm rod clamp for attaching lens motors, a female ARRI rosette for attaching Canon's handgrip, and a breakout box mounting area with 1/4-20's and recessed cable loops for attaching the Audio Breakout AB-10 (Canon C400) and DIN Timecode Genlock Breakout EB-10 (Canon C400), which are available separately.

Also included is a 1/4-20 knurled knob for attaching Canon's microphone shock mount to the top of the breakout panel.