Abus D66 High Security Cylinder Lock with Double Crossover. Best value for money on the cylinder market. Sold with 5 reversible keys and a key duplication card. Brass casing with 6 pins and counter-pins to prevent picking. The Abus D66 cylinder lock is equipped with a reinforced steel pin to slow down drilling. Double crossover cylinder: can be opened even if a key is in the other position. New pre-break technology: Pre-cut design that breaks prematurely and prevents total cylinder breakage. Once the cylinder lock is broken, the burglar can no longer do anything, but you can continue to use the key. Use of this Abus D66 cylinder lock: All doors with a European profile cylinder. Security rating: 7/10. Product details: Abus D66 cylinder lock with double crossover. You can therefore open the lock even if a key is already inside your home. A very practical and almost foolproof solution.