Perma-Column pre-cast concrete piers come in six sizes to fit a variety of post-frame building posts. All units are 5' long, plus the bracket. Just bracket a wood post or laminated column on top and place it in the ground 4' deep. This puts the wood post at least 12" above grade, so it may be treated or untreated. This ensures that the post will not rot off just below grade, for a long-lasting post-frame building.