Security Door Chain 1)Material:Zinc 2)Size:138x66mm 3)Finish:SC/SN/PC/AB/AC/GP 4)Suitable for Wooden door,Interior door Security Door Chain1)Material:Zinc alloy2)Size:138x66mm 3)Finish:Satin chrome,Satin nickel,Polished chrome,AB,AC,PVD4)Suitable for Wooden door,Interior door, Ecological door Security Door Chain