COSMOS &reg; Patent Metallic Keychain Keyholder with 4 Detachable Removable Rings Polished chrome plated keyholder, with 4 detachable exchangeable rings. A quick release ring to fasten to belt loop, hook, or other rings. Diameter of the detachable rings: 0.6 inches Diameter of the quick release ring: 0.75 inches Functional, quality design, good companion for key.