Schloßsicherungen Gera GmbH, established in 1994, was a company based in Gera, Germany, specializing in the development, manufacturing, and distribution of lock cylinders and master key systems.

In 2008, the company rebranded as ISEO Deutschland GmbH as part of its integration into the ISEO Group, which is a global leader in security solutions. The company focuses on providing innovative access control and security systems, including mechanical and electronic locks.