Snap EdgingThe next step is to install the snap edging around the outside of the walkway (figure N). This snap edging is going to contain the brick when you compact it, as well as contain it over time. You'll want to recess it just about a half inch below the brick, and then use metal spikes to secure it (figure O).
Drive your stakes in so that the point is angled outward and the head is in tight against the snap edging. It'll help keep everything secure.
Dean and Derek suggest using non-galvanized spikes because you want the spikes to rust. As the spike rusts over time they form balls at the end and they keep it from moving up and down.
Add a spike along the snap edging about every three to four holes and go all the way around the walkway.