Features: These round buckles are made of carbon steel with a painted surface that is not easy to break, rust-proof, and corrosion-resistant.Spring clip design makes them easy to open and attach to a variety of fixing points quickly. Good for connecting most handbags, backpacks, keyrings.Application:These O rings are multipurpose. It can be used for attaching key chains, luggage bags, and lanyards, extending the straps on handbags, shoulder bags. But also can be used as bind book rings, for hanging crafts or decorations, for beading projects, DIY crafts, outdoor camping activities, etc.Note:Although these spring clips are strong enough, only can hang or connect small items, not for some intense exercise such as mountain climbing or holding your boat to the mooring line.