Titan Wood Post Skirts are slim and low profile. Simply slide in the proprietary dovetail clips and slide each piece together. The large opening provides some give if you didn't install the post anchors perfectly square.
Apply a small amount of white glue to each face as you slide the pieces together, or dry fit and leave them be. Apply a sealant or stain on all four exterior surfaces accept the mating mitered surfaces.
The Titan Wood Post Skirts will NOT fit if you use hex head lag screws to secure the anchor to the deck.