This lock set is made of top-grade electroplated solid stainless steel for unprecedented durability and beauty. Its surface is treated with fine electroplating, not only anti-corrosion, anti-oxidation, but also gives it a silver luster, lasting, promising lifelong companionship, highlighting extraordinary quality. In terms of security performance, we are equipped with a 5-pin solid anti-collision lock core key lock entrance, effectively resist illegal intrusion, and add another layer of solid defense for your home security. The set includes 6-precision keys for easy use by family members while ensuring spare time. In terms of design, the all-metal adjustable latch fully considers the compatibility of different door types, suitable for a variety of door types with a rear distance of 2-3/8 in. to 2-3/4 in. (60-70mm) and a door thickness of 1-3/8 in. to 1-3/4 in. (35-45mm), easily adapted to a variety of home environments. It can withstand more than 200,000 uses without showing signs of wear, ensuring long-term use is still as new, so that every turn is smooth and comfortable. Installation is quick and easy. Special note: To ensure a perfect installation, remove the screws pre-installed in the handle assembly before installation and follow the installation guide to easily complete the installation steps.