The DJI R Briefcase Handle adds an extra dimension of support to the RS 2 and RSC 2 gimbals, attaching directly to one of the NATO mounts on the side of the gimbal and providing an enhanced way of operating the gimbal in low-angle mode.
Once it's attached, simply screw the gimbal's mini tripod onto the end and you'll have a rear handle to hold the gimbal with, and not only for low-angle shots but even for standard shots, in which case the handle will serve as an additional support for even better control of your gimbal. The end that the mini tripod attaches to is adjustable, so you can set the handle into the most optimal position for each scenario.