Make sure you pick a spot that will clear the glass and the door rolling gear.
How to install ultra patio door lock.
When you have added the main body of the lock and the lock bolts to the door then you can add the cover plate.
Place the metal punch over the door frame that you are working with and make a hole.
Make sure the lock is unlocked and place it on the mainframe of the door 2 5mm from the face of the sliding frame.
Then on the door where the slide bolt will go drill a hole where the bolt will be placed.
Screw this onto the door on top of the lock and then move it around so that it can be joined to the bolts.
After marking drill the holes for securing the lock to the frame.
Using the correct drill bit drill the holes that you have marked.