【Fit for wood post size】: The inside size of this matte black pyramid cap are 5-5/8" x 5-5/8", made for 6x6 nominal size post (5-1/2"x5-1/2" actual size). Robust and beautiful! | 【Product Size】: The height of the pyramid post caps is 1.97in/5cm, the depth of sit down on the post is 0.63in/1.6cm, sidewall thickness is 2mm. The solid thickness and reasonable size layout make it look well-proportioned and generous. | 【Sturdy pyramid shape】: This matte black pyramid post caps cover is made of high-quality aluminum alloy, finished with a durable laver of powder-coat paint, can withstand wind and rain, and will not rust and corrode. UV-Protected, Prevent fading due to sun exposure. Longer use! | 【Easy installation】: Each package contains four 6x6 black post caps and eight black screws, just put the post cap on the 6x6 nominal wood post, and then screw the two screws into the wood post through the small holes on both sides of the post cap. Very convenient! | 【100% satisfied】: If you are not satisfied with the size or quality of this 6x6 black post cap(actual/ture 5.5" x 5.5"), please feel free to contact us by email. Our post caps have a one-year warranty and can be re-shipped or refunded in full.