Package Quantity: You'll get 16 pcs spring o rings, more than enough to use in a variety of lifestyle scenarios, such as dga tag clip, backpack accessories and more O Ring Size: Spring o ring inner diameter: 1/2" (13mm), Outer diameter: 3/4" (20mm), thick: 3.9 mm. Key rings small and lightweight, convenient to carry and use, not easy to lose. Please understand, manual measurement may have 1mm error Versatile Clips: These spring o ring clips can be used to small key clip, chain extenders, attach keyrings, or fasten tags and backpack zipper locks. Use your imagination and use the spring o ring where you want Material: The round carabiner is made of zinc alloy with a smooth surface that holds nothing securely in place without scratching or damaging the item. Spring o ring available as your DIY craft accessory Spring Opening Design: The round snap clips feature an open spring design that can be easily opened or closed by squeezing the open spring position of the O ring with one hand, making them convenient for use on small purse chain connectors, chain extenders, and key for quick, tool free attachment and detachment These versatile carabiner clips are perfect for keeping your keys, purse and more organized. Made of durable zinc alloy, each clip features spring opening that securely fastens items together without worry of them coming undone. Use them to shorten the length of necklaces, bracelets or chains for a customized fit. Attach your pet's ID tag, house keys or key fob. They're great for clipping charms or pendants onto backpacks, belts or purse zipper pulls too. The Minimalist design won't burden the item, but it can't take too much weight either.