Most of our mortice latches and sashlocks are of the EasyT design.
This means you do not have to open the case to change the handing of the latch mechanism.
Please note there is a blue plastic "key" in the packaging, this "key fits into the slot behind the latch which is oblong in shape with one end rounded.
Push the blue plastic "key" fully into the hole ensuring the rounded side of the key meets with the rounded side of the hole. The latch will now be pushed slightly out of the front of the lock and can be turned freely 180 degrees so reversing the handing.