Expensive but no more neighbor’s yapping dog digging holes  running around my backyard. These are made industrial quality. You’re heavy in weight  could not even be cut with pliers. They do not hammer in all the way. Most folks have bedrock in their soil, so be prepared for that. Plus, with the rock situation you can’t make flush to the wood fence. Which leads to more difficulties weed eating. 
Overall, great product  does exactly that keep dock in or out of spaces.