I am not in the business, but I found this site and hoped for some info! I live in Colorado, and in the area is an abundance of shale, in huge ammounts! I have a piece of stone, about 3 feet long by 2 feet high, by 4 inches thick into which I carved the house and street address. It weighs about 300 pounds [a guess], and I want to set it upright into the ground. I have used a hammer drill to drill 2 holes into the base of the stone, into which I planned to set rebar, and place the whole thing into the ground,set into concrete. Anyone there have any other suggestions? I would appreciae the advice! Thanks!