AIDO master key system adds control and convenience to any building. The master key system can be designed specifically for your needs, regardless of the type of building, e.g. residential, commercial, small, medium, etc. A tailor-made master key locking plan includes a logical key and cylinder numbering system that is flexible enough to last. Master key system and a credible locking system security on both external and internal doors. High-quality materials-certified manufacture provides precise, reliable functionality and durability. AIDO offers a comprehensive cylinder portfolio - double, thumb turn, single, and emergency release cylinders with the right level of protection. There are various kinds of master key systems such as keyed alike, master key & grand master key system with 5/6 pins system and comes in a wide range of EPCs - types & length.