The C-Series Range With the trusted legacy of the Chubb brand at heart, the UNION C-Series range offers maximum quality and security, with a variety of mortice functions such as BS 5 lever and detainer locks with rollerbolt latches, narrow stile cases and hook bolt functions. C-Series Mortice LocksDelivering some of the most recognisable and trusted products on the market, the UNION C-Series range of 5 lever high security mortice locks offers a plethora of functions including deadlocks and... C-Series Detainer UNION C-Series Detainer locks use detainers which are more resistant to picking, and also provide a higher number of key combinations than lever locks. C-Series Cylinder LocksUNION C-Series Cylinder lock cases offer robust construction and high security locking with the advantages of cylinder locks.