Also called lobster clasp and lobster hook, the claw clasp is a jewelry fastener that is held closed by a spring. It is one of the most popular styles of jewelry clasps on the market. Claw clasps are frequently seen on necklaces and bracelets and are designed to be easy to grasp, open and close. Jewelry designers favor this clasp because it offers a secure grip. Another advantage is that it comes in many different sizes so it is suitable for most jewelry sizes and weights.