Metric O-rings 2mm CS x 20mm ID (20mmx2mm - 20x2 mm -2x20) 100 Count Orings Bulk | eBay
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Amazon.com: Solid Metal Rings for Crafts 1.5 inch Small Metal O Rings 12 Pack 4mm Thick Heavy Duty 1 1/2 inch Welded O Rings Metal for Sewing,Dog Leash,Dog Collor,Macrame Plant Hanger Metal