I had about 20' of wood privacy fence blown over snaped the post off at the gound during the blizard we had a few weeks ago, So I was going to replace it with new vinyl fence. Grabbed the hand post hole diggers and tried to dig a hole. Well I hit solid rock where I needed the hole. I had to go to the retal place and rent a 90lb. jack hammer to dig 3 holes and it took me 4 hrs of hammering. What should have been a 1hr job took 4hrs. Oklahoma is Gods country, no one else wants it. Just glad I wasn't digging a swimming pool.