Replacement for Volkswagen Security Master Locking Wheel Nut Key 530 Anti-theft Screw Socket Wrench Tool silver.Replacement for Volkswagen Security Master Locking Wheel Nut Key 530 Anti-theft Screw Socket Wrench Tool A Wheel locking key is a security device designed to your wheels from being stolen. It wouldn't be such a great security device if all cars had the same locking key. Your car could have one of hundreds of locking keys installed so it is important that you check the pictures match