Post Protector - Decay Protection 4x4x42 Simple Slide-on Decay Protection for IN-GROUND posts 42" length for Decks, Fences, Pergolas, Pole Barns, or any post-foundation project Extends IN-GROUND post life by 2-1/2 TIMES PLUS Minimizes chemical preservatives from leaching into the environment & provides weed eater protection Fits typical 3.5" X 3.5" posts