Unique Design: The half-shaped lock cylinder features a Grade B atomic structure, and the lock head is a Grade A cross-shaped core, providing excellent burglary resistance. Material: Made of high-strength chrome-plated zinc-plated iron, heat-treated and hardened for enhanced impact resistance and breakage resistance, preventing forced entry. Parameter: This lock measures 119 x 85 mm, with an 89 mm distance between the left and right locking points and a 72.5 mm distance between the top and bottom locking points, resulting in a compact design. Key: The key is thickened to prevent bending and breakage, has clean teeth, a smooth lock body, and comes with 5 keys to prevent loss. Wide Application: This lock kit is suitable for security doors, bedroom doors, entrance and exit doors, school buildings, construction projects, hotel projects, and more.