1、Concealing designs of the door chain, automatic rebound chain, the chain will extend when the door opens, so that you can see the outside of the door, and when the door closes, the chain will automatically rebound 2、Help identify the caller before the door is full released and forced to stop. 3、Can fit on any type and size of door at the same time, match with the house decoration. 4、Exquisite workmanship ensures the quality stability and durability of the product. 5、This anti‑theft door lock is made of high quality zinc alloy, which is resistant to wear, corrosion and easy to use. 2 x Door Chain2 x Accessory 2 x Lock Sheet 10 x Screw Condition: 100% Brand NewItem Type: Door ChainMaterial: Zinc Alloy Color: BlackSize: Approx. 89 x 52 x 25mm / 3.5 x 2 x 1inPurpose: Fixed doorScope of Application: Household, hotel, apartment, office, etc.