Premium Zinc Alloy Material:While most other door handles that use a combination of zinc alloy and stainless steel to reduce cost, our probrico door knobs are made of tough zinc alloy throughout.Electroplated gold finish is resistant to sunlight, rain and fog, and will not rust or peel off easily even in wet weather for a long time, or in humid areas such as coasts.While possessing ornamental value, it is also reinforced for greater durability. Heavy Duty & Long-Lasting:The privacy door lock weight is fully 1.8pounds,excellent workmanship,resistant to cutting and sawing,offering enhanced durability and superior security.Conformed with ANSI Grade 3 Exceeds 250,000 cyles and 5 pins brass tumbler cylinder,If it is opened and closed eight times a day, it can be used for 85 years. Adjustable Latch:Adjustable Latch with Backset 60mm(2-3/8") or 70mm (2-3/4");Fit all doors 35 to 45 mm ( 1-3/8" to 1-3/4")thick.Can be used for almost most door sizes.Notice: The latch plate