FULL 6x6 Heavy Duty Galvanized Post Cap (Inside Dimension is 6 in. x 6 in.) Made of Heavy gauge galvanized metal; Measures 1-3/4 in. from top to bottom, is 0.040" thick. Slips over a FULL-SIZE 6in. x 6in. post (actual post cap size is 6 inch x 6 inch) 4 corners of post may need to be slightly sanded or notched with a standard box cutter in order for caps to fit on post. Maintenance Free and is able to weather all seasons Easy installation, just apply exterior caulk to the under-side of the post cap.