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Iron Swivel Clasps, 31~45mm long, Mixed Style, Platinum, 31~45×13~23×5~8mm, Swivel Snap Hook, Mixed Style, Platinum
Size: about 13~23mm wide, 5~8mm thick hole: 5.5~9×9~18mm.
This kind of clasp is made of iron. You should notice that the lower part of the clasp is rotatable which means that it can be swiveled a circle