NextStone Slatestone 1pc 8" x 8" x 41" Post Cover Onyx Lightweight Easy Install Faux Polyurethane Stone Post Cover Sleeve  Already Assembled! Ideal for Deck Posts, Fence Posts, Yard Accents and Much More Fits over 6x6 or 4x4 Post (Actual inside dimensions of Post Cover: 5 1/2" x 5 1/2") 4x4 Posts Need Slatestone Post Cover Converter Kit  Sold Separately Matching Cap: Slatestone Post Cover Cap 10" x 10" Onyx  Sold Separately