51/2" Galvanized Postcap Made of Heavy gauge galvanized metal; Measures 1-3/4" from top to bottom. Slips over a 6 in. x 6 in. post (actual size is 5-1/2 in. x 5-1/2 in.) 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.