Good Construction: Made of SUS 304 stainless steel, this door chain ensures good quality and longevity. Wide range of applications: stainless steel door chains can be used on wooden or iron doors in homes, rentals, apartments, hotels and other places Brushed finish: The brushed treatment helps resist corrosion and stay like new after long use. Practical and reliable: this lock is very easy to install and solid. Includes four required mounting screws, no additional screws required. Press the anti-theft locking button with spring that provides protection against intrusions. Durable and tear-resistant: each ring of the security door chain is welded to prevent breakage and increase safety. Dimension: Body length: 12.3 cm chain length: 17 cm Package content: 1 door chain, 4 screws. Features Material: 304 stainless steel Lock size: maximum chain length is 20 centimeters Installation method: by screws Screw installation steps Use a marker to locate the punch hole. Drill the hole with an electric drill. Poke the rubber stamp in the hole. Fix the product to the wall with screws. Exquisite Details Made of 304 stainless steel with exquisite details, this door chain ensures good quality and longevity. Good Security Press the anti-theft lock button with spring that provides protection against intrusion. Package Contentsone door chain screwsx4 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.