3 inch Gold Plated Home Door Safety Security Chain Guard Slide Bolt Catch Latch LockSpecifications:Material: IronFinish: Brass PlatedChain Length: Approx. 17.8x1.3cm\/ 7.01x0.51"Plate Size: Approx. 8.5x4.2cm\/ 3.35x1.65"Chain Holder: Approx. 5.8x1.8cm\/ 2.28x0.71"Bore Hole Diameter: Approx. 0.4cm\/ 0.16"Features:This combination dead bolt and chain guard is designed for added securityCase-hardened chain is for added strength and cut resistanceAdd an extra layer of protection to your exterior doorsSuitable for wood and metal doors in the home、 office or other placesPartial opening of the door is permitted for ventilation or viewing while resisting possible forced entryThe install screws are not includedPackage Included:1 x Door Bolt