Some lever pad upvc door handles need to be fixed on the outside and used as a pull handle. This is the case where the lock itself rotates all the locking points as opposed to the uplift of the handle. The key would need to be turned 2-3 complete revolutions for the locks to work. These are great locks for security but are probably more rare nowadays. The stub spindle can be a good way to turn a lever or pad handle into a pull handle.