This is a TPU grommet that slots in the frame of a SpeedyBee Master 5 HD to hold the XT60 lead securely. It also acts as a strain relief for the wires and the ESC. I had issues using the XT60 panel mount connector on the frame and been flying with it loose. I've finally designed this grommet that secures it a lot better.
The author marked this model as their own original creation.