These metal loose leaf binder rings feature a hinge snap ring design, allowing for easy opening and closing. With a 20mm outer diameter, they are perfect for organizing loose leaf papers, documents, and other materials. Made from durable metal, they ensure long-lasting use and secure holding.Features:Made of tough metal, durable, will not crack, split or bend.Rings open and close easily and lock for extra security.Ideal for fastening any size document stack and keys and tool.Specifications:Product Name: Binder RingsMaterial: MetalColor: Silver ToneNet Weight: 74g/2.6ozThickness: 2mm/0.08Inside Diameter: 15mm/0.59 Outside Diameter: 20mm/0.8Package Content: 50(+/-2%) x Binder RingsNotes:1.Colors in the screen may not accurately reflect the true color due to individual computer monitors differences.2.Due to the different measure ways or tools, there may exist slight deviation (ranged at 1-3cm), hope you don't mind.