The RS Sigma system is the brand locking system for customers who value a high level of safety but watch their costs at the same time. Ideal in environments where there can be quite a lot of doors involved in apartment blocks, condominiums and other building complexes. Designed as a master-keyed system, RS Sigma offers you the convenience you can expect from a modern master-keyed system. You need the security, we offer the matching solution. Safe, fast and reliable. Simple to extend using the clip tag and compatible with the electronic locking systems from DOM, RS Sigma is future-proof and thus protects your investment long-term!