When selecting a car tyre lock, prioritize heavy-duty hardened steel construction to resist cutting, sawing, and drilling. Ensure the lock features a high-security cylinder (such as a crescent or atomic lock core) that is difficult to pick. For maximum protection, choose models with a protective disc that covers the lug nuts, preventing thieves from simply removing the entire wheel. Additionally, look for brightly colored powder coatings (yellow or red) which serve as a visual deterrent and provide weather resistance against rust and corrosion.