Zink alloy swivel lobster claw clasps made of zinc alloy with dimensions of 32 x 11 mm and with an eyelet for a thread with dimensions of 5 x 10 mm. Zinc alloy is commonly referred to as jewelry metal.
It is an alloy without exact proportions of individual metals and each manufacturer adjusts it to their needs. The largest share in the alloy contains zinc and then usually copper, but some manufacturers replace it with iron or nickel. In small and trace amounts (0.01 - 1 %) then the alloy can contain a really varied mixture of impurities (including non-metallic elements such as phosphorus, silicon, carbon and others) - some are used to reduce the price of the alloy, others to improve their properties.
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