Myard PNP 115445 Screw-FREE Universal Fence Pyramid Top Cap fits Post 4"x4" & 4.5"x 4.5" (Actual post size 3.7"x3.7" & 4.2"x4.2") (Qty 5, Black) *** IMPORTANT: Fits standard posts of 4x 4 (actual 3.5"x 3.5") inches. But also 4.5x 4.5 (actual 4x4, at second stage, see RED square mark in images). See images, or ask us if any questions before ordering. Thanks. Glossy/shiny surface on top; Matte/fog surface on bottom base. 5 holes at bottom base for gluing on 4"x 4" post, 16 holes for 4-1/2"x 4-1-2" post.(see images) Screw-FREE (Nail-FREE) installation. ONE-PIECE structure, solid and durable. Pack of 1. Sanding / trimming may be required depending on post type and little size error. Patent Pending  Made from HIGH impact, UV stable (anti-UV) ABS resin. Same as Golf Course Sprinkler head.