This is a custom back plate for the Kenwood TM-D710 Amateur Radio Transceiver head unit. It bolts onto the OEM holes. Use M3x12 screws with lock and flat washers on each hole to distribute the clamping force better. This is printed in PLA, but I may need to print it in ABS if the car heat impacts it. Ram Mount publishes their dimensions, so I was able to replicate the exact dimensions of the shaft, ramp, and ball diameter exactly.