If you are going to be using No-Sag or "Zig-Zag" Springs, you are going to need to attach them with the right fasteners. Different frames sometimes will call for a different type of attachment. This particular attachment fastens to the top of your furniture frame, but allows for a tolerance where your nails attach through the holes, giving it some movement if you need to adjust your clips.
These clips sell by the pound. 1 lb. contains approximately 100 clips. You will need 2 clips per spring.