24 Rings 1-1/2 Inch Split KEY Ring Connector Keychain Zinc Plated Spring Steel Made in the USA Single Loop Wire Thinkness .092 Approx. Thickness .163 in./4.14 mm Outside Diameter 1.640 in./41.66 mm Approx Inside Diameter 1.424 in./36.17 mm Blue Zinc Plated Stainless Steel