KaShDa 6 Silver Plated Double Lobster Claw Clasps Necklace Extenders 1 1/4, 2", 3", 4", 5" & 6" Set of 6 Double Lobster Claw extenders: You will receive 1 each 1 1/4", 2", 3", 4", 5" and 6" extenders. 3.7MM Silver Plated Brass Core Curb Chain with links that will accept clasps up to 3MM wide. 12MM (1/2") Silver Plated Brass Core Superior Quality Lobster Claw Clasps. Use with your chunky necklaces, these are strong enough to hold jewelry pieces weighing up to 15 ounces. The stated length includes the clasps.