2" Black Aluminum screw posts are anodized with a strong coating that will last a long time. The post is 2" in length and has a 3/16" diameter. They are sold in sets with a male and female end and a thread size of #8/32. Black aluminum posts are great for binding books, making scrapbooks larger, holding together swatches and so many more projects. With the shiney black finish it just gives your project that little extra boost it needs to look great.