EASY INSTALLATION: Fit on standard pre-drilled doors, install the door lock easily and quickly. You only need simple tools! No need for professional door fitters, you can do it by yourself! Please note that the key of each lock is unique and multiple locks cannot be opened. .SAFETY LOCK : Adopt stainless steel structure, strong and heavy, with anti-pry and anti-collision function, can provide excellent protection. Turdy and practical rotary lock, can be unlocked from the outside by a key, and locked by the inner rotation. Exceeds 200,000 cycles. .HIGH QUALITY: Door handle with lock and key high-grade Copper Lock Core, thick material, wear-resistant and anti-corrosion. To provide you and your family with higher safety and security. .SCOPE OF APPLICATION: This spherical door lock is fit standard door thickness 0.98"(25mm) to 1.77"(45mm), adjustable Solid Latch Length (the distance of Hole Center to the Door Edge): 2-3/8"(60mm). Suitable for indoor, bedroom, bathroom, gate, study, privacy, storeroom, kitchen, office, school.