Easy installation: install the door locks on the door frame with an electric screwdriver and a drill bit to complete The reinforced door has been installed for less than 5minutes Equipped with two sets of screws, four 1-inch ( about 2.5cm) and four 2-inch ( about 5.1cm) screws, and the length of the screws can be selected as required Child-proof and tamper-proof: this door guardrail adopts spring-loaded design to the of children This provides an additional layer of security for your bedroom, front door, or any other entryway Rest assured knowing that your doors are reinforced and protected Keep your home safe: the door is designed to withstands 800 pounds ( about 362.9 kilograms) 12 times strongers than the ordinarys door bolt, to being kicked in Easy to use: put your finger on the top of the door, slide the away from the bottom plate along the direction of the door, and then pull it outs, Manufacturer: JAZUAIAO