Both holes in all the cement blocks are filled with cement. One side has a 12" spike in the ground sticking up about 4" in to the hole of the cement block. The other hole has a foundation hook running through the 4"x4" and hanging down about 4" in to the block. Both the spikes and the foundation hooks are cemented in place. The detail also doesn't show that the topside of the foundation hook is countersunk in the 4"x4".