Dual spindle refers to there being two separate spindles usually used in lever pad door handles which are offset different heights.
Front door split spindle.
In photo 24 the door is 1 3 4 plus about of trim.
It is in fact the key that turns the latch bolt.
The overall dimension is 2 1 2.
This is because if you push down the outside handle it will not operate the latch bolt in the door.
Split spindle relates the actual spindle inside the handles having a split in the middle.
Era upvc split spindle pack door handle and door lock for key only entry by era 54 72mm era 4 2 out of 5 stars 3.
Add to this size a sufficient length for spindle to attach your knob or lever.
Try to measure the overall thickness of the door and trim together at the point the spindle passes through the lock.
Changing from single to split spindle operation.
Door spindles connect the doorknobs on each side of a door.
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Spindle 8mm x 4 15 16 split 125mm length 2 1 2 door split spindle for 2 5 inch thick doors.