This sturdy nickel-plated Binder Rings with riveted hinge are easy to use. Convenient to bind loose-leaf paper, they are also a good alternative to group keys together rather than the traditional 'Split Ring'. These binder rings have a locking mechanism that opens easily to add or subtract materials, yet locks securely once it is closed. 

• 25 mm diameter
• 3 mm ring thickness
• nickel-plated
• 20/pack