ARRONE ® Plus cylinders are available as standard differ stock, keyed alike or master keyed to individual requirements. CES Softline and ARRONE ® Plus cylinders operate on 6 pins making them suitable for complex grand master keyed suites. The diagrams on these pages give a guide to the many keying arrangements possible. There is often confusion between keyed alike locks and a straight master keyed system. In a keyed alike arrangement all the locks operate using the same key. However in a straight master keyed suite all the locks can operate off different keys, but another key (called the master key) will open them all. Master keyed suites often have Sub Suites. Examples of this could be seen in a small hotel where the hotel manager has a master key to open all doors. A chambermaid could have a sub master to open a range of bedroom doors only but none of the offices for instance. An individual room key in this arrangement is referred to as a servant key. Varying degrees of complexity can be achieved to suit a variety of needs and examples of these are shown in the accompanying diagrams. The common entrance suite is useful in student accommodation or a block of flats. This suite removes the need to hold two keys, i.e. one for the front door and one for an individual room. A common entrance key will open the front door and the individual room. In any master keyed suite, regardless of size it is wise to look ahead to future growth. Provision can be made in the suite for extensions at a later date. This is always easier to do at the time the suite is created. It is recommended that master keying requirements are checked with our sales office to ensure suite arrangement is possible. Keyed To Differ Cylinders to differ are all operated by individual keys all different to each other Keyed Alike Suites (KA) In keyed alike arrangements all cylinders are operated by the same key. This gives an arrangement where one key will open a group of locks. Not to be confused with a master keyed suite (see below). Cylinders can also be keyed alike to the euro profile, oval and rim cylinders. This is useful where a combination of cylinder mortice lock cases and cylinder rim nightlatches are being used. Common Entrance Suite Common entrance (or flat entrance) suites are designed to enable a tenant to use the same key for his own private doors as well as doors common to other residents within the same buildings. The common entrance feature can be incorporated within any master key suite. Master Key Suites (MK) In Master key suites, a group of cylinders, each equipped with an individual servant key, is also operated by one special key known as the master key. Keyed alike groups can also be incorporated into any master key suite. Grand Master Key Suites (GMK) Grand master key suites are used when it is necessary to have more than one master key group. These groups are referred to as sub suites. In these instances all cylinders irrespective of their sub suite, are controlled by one key known as the grand master key.