Material:Zinc alloy Color:Black Nickel Function:Locking door leaf and safe-guarding Features:Elegant and durable Available for:All kinds of doors Package Included:1xSecurity Door Guard,Screws included Warranty Description : 5-year replacement warranty from seller Installation Instruction: 1.Make sure both the door and the wall must be flat and at an even surface with each other.If there is door with molding,you should prepare some pieces of washers that match the holes in the hardware. 2.Figure out where to install the security door guard and drill holes. 3.Install the lock on the trim side first and then line up the ball part on the door. 4.Tighten each screw,done. TOGU security door guard is great-especially for wanting to increase the security of your front door,it's sturdy and reliable and gives you sense of security to sleep with less worry that someone can enter by just picking the lock.This mechanism allow door to be opened slightly for viewing.A must to have one for a house if you have a child who likes to open the front door or if you are living alone.They are easier to open and close than a traditional chain or bolt,once installed,this security hardware start to protect your home and loved one. This top quality security door guard is currently on a special promotion,giving you security and privacy at a great value price! TOGU Hardware Company provides high quality and reasonable price household door hardware, kitchen hardware and bathroom hardware,we sincerely hope that we could have the honor to contribute all our intelligence and effort to work together with you to make your home comfortable,safe,relax and artistic.