The addition of the Sigma FP Side Plate opens the door for better protection and rigability for your Sigma FP or FPL. Once in place (via 4 M3 screws), your Sigma FP is now fully enclosed by the XLCS Cage. The side plate adds an additional 21 mounting points--including 2 M4 holes which allow you to use the XLCS HDMI and USBC Cable Locks (sold separately). Additionally, a 1/4" hole on the back side of the plate is spaced exactly 60mm from a 1/4" hole on the cage--meaning you can add 2 of our threaded 15mm rods to have a native rail system which lets you use 15mm rod accessories like battery plates without the need to add a full rod mount to the cage. A 1/4" hole on the face also provides a mounting point for another threaded 15mm rod--which can serve as a mount for a follow focus unit or motor. Lastly, internal cutouts mean you can hold back the Sigma FP's rubber port flaps which cover the microphone and USB port--providing easy access to the ports during use. The Sigma FP Side Plate is a great addition to your rig--and will help you get the most from the XLCS Cage system. Includes: Sigma FP Side Plate, 3x M3 screws, 3mm Hex tool.