This is a mount for the Boss XL or Medium frame that will hold the RunCam Swift 1 or 2 micro.
It holds the camera back a little further in the frame to help protect it in a crash. The hole for the spacers is 4.9mm, instead of 5mm. This will make the fit a little more snug and less likely to slide up or down on the spacers during an impact. If you print this out of something a little stretchy, like TPE, it is perfect fit. If you print it out of TPU, it will fit fine, but will be very tight. If you try to use this with the RunCam Eagle micro, the camera will sit too far forward in the frame.