Door chain. Material:Brass/Steel, Finishing:BP.CP,SN,NB Protection force:350 N High quality and cheap price Door ChainItem No.:DC-01Material:Brass/SteelFinishing:BP,CP,SN,NBChains are tested to protect 350N forceISO9001:2008High standard polishingHigh standard finishingHigh quality fixingsHigh quality and cheap price Door chain