1.Material:brass 2.Surface finished: P&L, S&L, CP, NP, SCP, SNP, GP, AB,AC 3.OEM is available Brass security door chain1)Material:brass2)Surface Finish:P&L, S&L, CP, NP, SCP, SNP, GP, AB,AC3)OEM is welcome Advantage Of hinge: 1)Good quality with best price.2)Self-manufactured and direct selling.3)High reputation, good credit standing and on time delivery.4) Have a good after service