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4" x 4" Trex Flat Post Skirt
Trex's highest-performance railing option won't rot, warp, peel or splinter (which trumps sanding row after row of wooden balusters any day) and it never needs painting or staining, ever. Talk about luxurious. The actual external dimensions are 4.55" x 4.55" (115 mm x 115 mm).