Available in 9′ and 7′, these high black angled steel posts are great for rocky soil. You can buy Angled Freedom Posts in packs of five or eight posts. They will each finish about 1′ lower than their indicated measurements (e.g., the 9′ post will install at 8′).
You may drive the posts with a sledgehammer or a post driver. The Angled Freedom Fence Posts for sale are so hard that they often will punch right through the rock.