Koresapo Collection Binder, 30-hole, 3 books Metal rings Spine width 35mm A4 wide refills can be stored, such as magazine refills and instruction manual refills. I used these, but I no longer need them, so I'm selling them. Up to 6 books can be sold as a set. Shipping costs can be discounted. If you would like to purchase a set, please comment in the comment section.