These iron post caps can be used indoor and because of our multiple coats in a rust preventative finish, they can also be used outdoors as well. These items are not only adding an amazing decorative finish that brings the home together but also adding protective covering to your post. Unlike usual wooden or vinyl post caps these iron post cap require less maintenance yet provide more structure. We have many options to choose from allowing you to go from a simplistic look or an all out piece of it's own. We are happy to assist with any custom sizing that you are not able to find online. Post Base Sizes Below: 3 1/2 x 3 1/2 is 2 3/16 tall 4 x 4 is 2 1/2 tall 5 1/2 x 5 1/2 is 3 7/16 tall 6 x 6 is 3 3/4 tall 7 1/2 x 7 1/2 is 4 5/8 tall 8 x 8 is 5 tall 9 1/2 x 9 1/2 is 5 7/8 tall 10 x 10 is 6 1/4 tall 11 1/2 x 11 1/2 is 7 1/8 tall 12 x 12 is 7 7/16 tall All sizes can be modified for $15 fee This post cap features a glue-on design for easy installation. The rivets visible in product photos are welded directly onto the cap for authentic detailing and durability. These post caps are made from 1/8" thick mild steel.