Install and secure all 3 screws.
How to install a door slide bolt.
A typical placement is one or two feet above the knob but it can be lower.
Mark fixings for door keep.
Extend the bolt out slightly and push the bolt keep over it.
If you need a stronger latch it will require a lot more work.
Close the door up until the keep touches the door frame.
The closer it is to the center of the door the more.
An outside sliding is a door in which the moving door is on the outside of the house whereas an inside sliding places the moving door on the inside of the house and the fixed one on the outside.
Glue this to the door where you want the bolt lining up the front edge of the plywood with the edge of the door.
Level up the door bolt and then mark drill and screw the top screw hole nearest the door.
How much strength do you need the bolt to have.
Install the barrel bolt at a height that is easily reachable.
Cut a piece of plywood larger than the size of the bolt.
It will be necessary to drill deep enough to allow full extension of the slide bolt in order to secure the lock.
Then screw the bolt onto the plywood.