What is this?The chain is used to hanging or holding things on the ceiling or in other places. Widely used on hanging the pendant lights, chandelier, front door light, plants basket, lantern and etc.What will I get?Product Name: Pendant Light Fixture ChainColor: BlackMaterial: Electroplated IronMax. Load: 20kg / 44.1 lbChain Length: 0.91m / 36“Chain Thickness: 4mm / 0.16"Chain Inner Size: 38x13mm / 1.49"x0.51"Chain Lock Open Width: 8mm / 0.32"Chain Lock Inner Size: 37x11mm / 1.46"x0.43"Hook Ring Height: 37mm / 1.46"Hook Ring Thread Size: M10*1Package Content: 1 x Chain; 2 x Chain Lock; 1 x Hook RingAre there any advantages of the product?The chain lock and close ring have threaded ends to ensure it is tight and stable. And the chain length is adjustable by increasing or decreasing the number of links if you want.How to use it?1.