1/2" Aluminum Screw Posts are Anodized with a hard coating making them an Antique Brass color. The post length is 1/2" and the diameter is 3/16". This is no including the head of the post or the screw. Post and screw heads are 7/16" diameter and 1/16" thick. The screw thread is #8-32. These posts come with a 3/8" long screw. We recommend that you measure your document to obtain the best fit. These posts are the industry standard size. They are compatible with all standard posts, including those sold under the Charles Leonard brand. Quantity per package is 20 for these aluminum screw posts. We can supply larger quantities on request. Please call for a quote on orders of 30 or more packages.