Effortless assembly (Before , make sure that the lock size fits your door!): It can be easily installed with a screwdriver. Please make sure that you fit your door thickness, your hole range and your hole size. The lower screw can be adjusted from different centers to the center by complying with perfect harmony each time. The screw pole you will hold is between 7-2/3 to 8-6/7 '(195 mm-225 mm, #29 to #35) . LIFE LIFE: This door handle set, which is produced from the heavy type zinc alloy, can withstand up to 1000 N vertical pulling force and tested to open the doors more than 250,000 times. Advanced electrocapping spray paint also provides high -strength corrosion ability, providing a smooth surface for years. Safety, compatibility and universality: This pre -entry handle set is not only , but also compatible and universal. It can be joined with an electronic bolt for a complete pre-entry set and complies with standard doors of 1-3/8 '' to 1-7/8 '' (35-45 mm) thick. The 6-way adjustable latch can also comply with any 2-3/8 (60 mm) or 2-3/4 '' back set (70 mm) Conservation of every air: The ability of the handle set to withstand all kinds of weather conditions means that you don't have to worry about rain, sun or abdomen in your front door. Your satisfaction is our most important priority: Element 2 -year factory . If you are not satisfied with our handle set for any reason, just us for a smooth .