These will not work with a Wilson Jones Binder.
Our aluminum screw post extensions can be used to extend the length of any of our aluminum screw posts. These extensions will extend the existing binding length by 3/4". The screws that came with the posts that you are extending will also fit these extensions. We do carry the 3/8" screws if you should happen to need extras.
These extensions do not work well with 3/16" or 1/8" screw posts. The screw thread is too long and will stick out the back of the post. Any post from 3/8" up will work just fine.