The Tessi 6410 shutter lock is usually installed in the centre of the door. Both side arms extend when operated, these are linked to the shutter's locking bars, these lock the shutter into both sides...
The Asec FB2 2 lever mortice deadlock is designed for use by the London Fire Service. This lock operated by an FB2 mortice key which is available to purchase separately.
This Winkhaus split spindle is designed to be used with Winkhaus locks and the Palladio range of furniture. It is 8mm diameter, supplied without a spring and available in a choice of lengths.