Master key systems Master key system (MKS) is essential application for office and hotel buildings, providing convenient access control and peace of mind for your employees and customers. With over 15 000 completed systems worldwide we can provide a solution that fit best your needs. We also offer express service for 24, 48 or 72 hours to calculate MKS especially for you! ASSA ABLOY Opening Solutions Bulgaria has developed and installed over 15 000 Master Key Systems in whole Europe . We can offer systems of low, medium and high class and has developed its own generating software, which optimizes every system taking into account its individual characteristics and excluding repeating key differs on geographical principle. The company has developed common master profiles, which guarantee the production of complex Master Key Systems with more than 5 000 cylinders. The long-term service and the fast reaction rgearding the key and cylinder copies have established our company as one, which makes no compromise in terms of solving every customer's issue. Every developed Master Key System is unique and flexible, including in itself different types of locking. In this way one can operate the entrance door, the garage padlock or the postbox with only one key.