Before buying anything you need to do some measurements.
First we did a basic drawing of the area. This helps us keep our numbers straight. It doesn’t have to be anything fancy.
Mark where you want the posts to go. This will serve as a reference point.
We will then make the following measurements:
1. The height of the steps
2. The depth of the steps
3. The distance between the edge of the step and the post markers (offset)
Write all this information down on your drawing.. when you finish you should have something like the attached picture.