The steel parapet coping will be attached to coping nailers on the inside of the parapet, and coping cleats on the outside. Because the steel coping will be held by the coping cleats, there will be no visible fasteners on the outside of the parapet.
I fit the coping cleats to the various sections of the parapet edge, and anchored them into the parapet top with masonry anchors. In the process, I kept checking the distance between the outer edge of the nailer and the cleat to make sure that it fit the width of the steel coping I had ordered.