Good concept, moderate execution. I bought the lock for my plug-in bulkhead, because it can also be operated and closed from the inside, without a key on the outside. At the very high price but I would have expected more quality. Criticisms: 1. As delivered, the lock from the second lock level could only be opened from the inside. Luckily I realized that before I locked myself out! Cause: Sloppy processing, the locking mechanism apparently comes directly from the punch without significant deburring in the housing. Only after dismantling and a long "dremeln" the lock was usable. 2. The lock cylinder corresponds to the safety only her simplest requirements ("furniture lock"), and that at the price! 3. As additional keys only blanks are delivered, so to locksmiths and another 5 euros per additional key press. 4. Assembly costly: no drilling template, mounting position must be determined, costly adjustments required, only on thin bulkhead (or accordingly deep recessed) can be installed, since the key can not be rotated when the cylinder is more than about 3 mm "in the rosette "disappears