I put in the temporary posts for traffic control during Halloween and for Christmas decorations.  My soil is heavy clay so when it gets wet, it swells and locks the poles in place.  Trying to pull them by hand was a horrible job.  I was going to fabricate something, then I saw this.  So quick and easy.  I can drive the posts in 18 inches and this will pull it right out.  No more back straining work or wiggling the posts back and forth trying to break them free.