How do I install my house number with a flush mount?
A flush mounted house number is the term used to describe when the number is mounted flat against the mounting surface eg your fence, and there is no gap between the number and the fence.
For a flush mount you insert the [included] rods in to the back of the number, and drill corresponding holes for the rods on your mounting surface. No need to use the spacers.
Alternatively, and also with smaller 100mm hight numbers, you can simply use a suitable epoxy adhesive to glue the numbers in the desired location.
Full installation instructions are included with each order and can also be viewed
here.