This set of 12 Supertech Audi/BMW/Opel 6mm stem triple groove valve locks is designed to secure the valves in place in your engine. Each valve requires two locks, so this set of 12 will be enough to secure 6 valves. The locks are made from high-quality materials for maximum durability and reliability. They feature a triple groove design for a secure fit and are easy to install. They're perfect for anyone looking to keep their engine running smoothly and efficiently.