2-1/2" Black aluminum screwposts are great for binding: Swatches, Menus, Reference Books, Scripts, Scrapbooks, etc. These black aluminum screwposts are durable so they won't break and will keep your bound document secure. They are manufactured the same as our Aluminum screw posts, then a hard anodize coating is added to produce a black color. The post length is 2-1/2" and the diameter is 3/16". We recommend that you punch or drill a 1/4" hole in your documents to accept these posts. Post and screw heads are 7/16" diameter and 1/16" thick. The screw thread is #8-32. Quantity per package is 100 for all aluminum screw posts. We can supply larger quantities on request. Please call for a quote on orders of 30 or more packages. 3/8" long screws are furnished with all posts.