Approximately 3.5x12x2.5mm sterling silver double-push lobster clasps (lobster claw clasps), approximately 1.5x3mm inner diameter. Directly imported. Lobster clasps (also called trigger clasps and parrot clasps) are one of Rings & Things most popular clasp options. Press button on either side to open clasp - no levers! If you have trouble with fingernails breaking from regular lobster clasps, this is the clasp for you! Wide loop in base.