A round spring clasp (also called a spring ring clasp) is a very common type of jewelry finding used to securely fasten chains, necklaces, and bracelets.

Here’s a description tailored for stainless steel:

• Shape: It is a small, hollow, circular component with a spring mechanism inside.

• Mechanism: One part of the circle has a tiny lever or trigger. When you pull the lever back with your fingernail, a small section of the ring retracts inward. This creates an opening where you can attach or release a jump ring, chain end, or loop. Once released, the internal spring automatically snaps the section back into place, closing the circle securely.

• Material: Made of stainless steel, it is highly durable, resistant to tarnish, rust, and corrosion, making it perfect for everyday wear.

• Size: They usually range from 5mm to 10mm in diameter, depending on the jewelry piece.

• Use: Ideal for necklaces, anklets, and bracelets, especially where a strong but discreet fastening is needed.