: The diameter of the hole should be three times the width of the post (e.g., a 4-inch post needs a 12-inch wide hole). 4x4 Wood Post : 10–12 inch diameter hole. 6x6 Wood Post : 12–16 inch diameter hole. Phase 2: Setting the Post

: Place the post in the hole and use a spirit level to ensure it is vertical (plumb) on all sides.

The you're working with (e.g., soil, concrete, sloped terrain). Installation – PostMaster Fence

The you are installing (e.g., wood, metal, vinyl).