Lonsdor for BMW G-Series BDC3 Solder-free Clip for Lonsdor K518 PRO. Lonsdor for BMW G-Series BDC3 Clip Adapter to Copy BMW BDC3 Key. This ensures a stable connection to the necessary points on the BDC3 board, allowing your Lonsdor K518 ISE or K518 PRO to read and write data safely and efficiently.