Features: Sturdy Material: zinc alloy, heart shape spring loaded gate lock, polish nickel plated, safety approval. anti-rust, anti-corrosion. Sturdy and durable, open and close smoothly. Designed with built-in spring, press to open. Note: These spring clip round carabiners can not be used for some intense exercise such as mountain climbing or holding your boats to the mooring line although it strong enough. Application : these circular clips can be used for keys ring, dog leashes, luggage bag, exercise bands, webbing and lanyard, also can be used to extend the strap on your hand bag, shoulder bag or body purse. Please check the size before you purchase. Specifications: Material:Zinc Alloy Color:Light Gold,Silver,Gold,Black (optional) Size:Approx.15mm/0.59'',19mm/0.75'' (optional) Package Includes: 1x Spring O Ring note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.