Security lock for the Ikea Billy/Oxberg bookcase, equipped with a Rothult NFC lock. Each Rothult package comes with four M4x29mm screws to mount the Rothult to the adapter plate, two 4mmx13mm screws to mount the adapter plate to the Billy, and one 4mmx15mm screw (packaged with L-bracket) to mount the locking fingers on the door. It is recommended to use double-sided tape to find the correct positions before screws are permanently attached.