Uxcell 6mm Oval Shape Quick Link Screw Lock Chain Connector Bronze 6 Pack Made of electroplated iron material with good rust resistance and high strength. Threaded ends and hexagon nuts to ensure it is tight and stable. Self-locking design it is easy and fast to open and snap with the screw lock. Widely used on the pendant lights chain keychains backpack ropes and some DIY accessories that hold things together.