These posts are manufactured the same as our Aluminum screw posts, then a hard anodize coating is added to produce a black color. These posts are ideal for uses where an enhanced appearance is desirable, yet the strength of aluminum posts is required.
The post length is 5" and the diameter is 3/16". The post length is the maximum binding thickness (inside length.) We recommend that you measure your document to obtain the best fit. If necessary, aluminum screw post extensions can be added to the standard aluminum screw posts to achieve a better fit. We also recommend that you punch or drill a 1/4" hole in your documents to accept these posts.
If you would like to have a different appearance, you might want to look at our plastic screw posts. If you need greater strength to hold large or heavy materials, please consider our steel screw posts.