Briton Door Selectors are designed for use on pairs of doors where the inactive leaf is required to close before the active leaf. The door selector is suitable for double rebated doors and fire doors. Door coordinator is a basic requirement for all self-closing pairs of doors that are rebated or have astragals.The Briton Door Selector is a medium-duty commercial product for use in projects with double doors such as electrical cupboards, duct doors or plant rooms.allows double doors to close in the correct sequencebody length 75mmbody width 32mmbody depth 19mmarm length 230mmsuitable for maximum door width of 2400mmfinished in silver