A lobster claw clasp opens when you push backwards on a little lever that slides along a circular ring. Once the clasp is open open you simply insert the chain or loop that is attached to the piece you are connecting into the open circle then release the lever to return it to the closed position. There is a tiny spring inside the clasp that puts pressure on the mechanism to keep the spring ring shut until you decide to open it again.Lobster claw clasps are commonly used to secure necklaces bracelets and anklets but some people have a difficult time operating very tiny spring clasps by themselves. Clasps that attach to a good sized loop that you can handle easily--or to a rigid piece--are easier to handle.