Wide range of uses for loose-leaf, flash cards, memo filing, key rings and sample holder<br> Closed tight, not scattered after collapse, keep your desk always organized<br> The steel metal round rings can be split into two halves and is held together by a metal swivel rivet which is located at the center of the ring<br> You can easily link numerous loose-leaf booklets, paper cards, name tags, instruction guides or plastic plates together<br> How to use:<br> The loose book ring has 2 parts and is linked together by a swivel rivet, very easy to operate, you can pull the opening to open and squeeze to close.<br> Notes:<br> Do not leave your children using the book rings alone, adult supervision is required.<br> size:Line thickness 2.1mm, inner diameter 20mm, outer diameter 25mm<br> Material:iron<br> colour:Silver<br> Package Contents:<br> 100 * Binder Rings<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.