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A simple coldshoe mounting point for cameras or cages that lack a hotshoe, or in cases where more are needed than are available. A coldshoe is a common way to mount monitors, microphones and lots of other equipment on a video rig, so it's always handy to have extras.
This specific part is designed because my Blackmagic Design Pocket Cinema Camera does not have a hotshoe/coldshoe. However, it does have a top 1/4-20 mounting point. So instead of buying one of these from Amazon and waiting for delivery, I designed one quickly in Fusion 360.