These mounts allow you to replace your DJI Phantom's legs with carbon fiber tubes.  There is a fifth "leg" which holds the compass where it should be.  The carbon tubes are 3mm in diameter and can be found in DYI shops and on the net (e.g. dx.com).The mounts are designed to allow you to simply switch your existing legs with the new supports. You can reuse your existing screws.  I used some epoxy glue to ensure that the carbon fiber tubes stay in place.