3 1/2" Black aluminum screw posts are anodized with a black durable coating. This coating keeps them strong like the aluminum screw post yet adds a little flair to any project. Black screw posts are great for binding books, scrapbooks, menus, swatches and many more. The post length is 3 1/2" and has a 3/16" diameter. The post is measured as just the posts excluding the heads. You will only get 3 1/2" out of this post. These posts come with a 3/8" screw that has a thread of #8/32. You will need to drill or punch your hole for a standard 1/4" in order to have the posts fit correctly into your project.