Approximately 10x19mm swivel sterling silver lobster clasps (lobster claw clasps) with 1.8-2mm inner diameter loop. Lobster clasps (also called trigger clasps and parrot clasps) are one of Rings & Things most popular clasp options. The large opening in this versatile clasp allows you to hook it directly into any link of large-link chain, or use it in the front of a necklace as a charm holder. It pairs excellently with our #44-048-20 sterling heart charm. Questions? Call our friendly sales staff at 1-800-366-2156, or email us.