DURABLE MATERIAL: Made of high-quality alloy metal, strong and durable. EASY TO USE: Each key ring comes with a separate jump ring, allowing easy attachment of charms or accessories without additional effort. Ideal for simplifying DIY projects. PACKAGE INCLUDES: 100 flat key rings with chain, open jump rings, and screw eye pins. SIZE DETAILS: Split ring diameter approximately 0.85 inches (21mm) with a 0.98-inch (25mm) extension chain. Open jump ring diameter is 0.24 inches (6mm). Screw eye pin length is 0.39 inches (10mm). SUITABLE FOR DIY: Perfect for use in keychain making, phone accessories, bags, purses, and other decorative crafts. SPECIFICATIONS: Material: Alloy. Diameter: Approx 21mm (0.85 inches). Note: Please allow 1-2cm measurement deviation due to manual measuring. The actual color may vary slightly due to monitor display differences.