Master key systems The master key system (MKS) is an essential application for office and hotel buildings, providing convenient access control and peace of mind for your employees and customers. With more than 15 000 completed systems worldwide we can provide a solution that fit your needs best. We also offer express service for 24, 48 or 72 hours to calculate your tailored MKS! ASSA ABLOY Opening Solutions Bulgaria has developed and installed over 15 000 Master Key Systems all over Europe We can offer systems of low, medium and high class cylinder platforms. We have also developed our own MKS generating software that optimizes each system taking into account its individual characteristics and eliminating the repetition of key differs on a 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 after sales service and the fast reaction regarding the key and cylinder copies have established the ASSA ABLOY Opening Solutions Bulgaria as the company that makes no compromise in terms of solving every customer's issue. Each Master Key System executed by the ASSA ABLOY Opening Solutions Bulgaria is unique and flexible, ensuring all required access points. This makes it possible for an individual to operate the entrance door, the garage padlock or the postbox with one key only.