It's easy to make intriguing books with post bindings. Use a single post for a book with swing-out pages. Use two posts to make stylish books or practical, expandable albums-simply unscrew the two parts of the post to add additional pages. Drill through the pages of your book using a 1/4" drill bit to accommodate the 13/64" diameter posts. The diameter of the screwheads is 3/8". Posts and screws have a bright aluminum finish. We offer two sizes. 1/2", pack of 25 posts and screws -OR- 1", pack of 25 posts and screws.