KEYED SYSTEM: A single key is designed to operate only one specific lock. The smooth-rotating internal thumb-turn knob enables quick locking and unlocking, making it ideal for bedrooms, offices, and front doors. QUALITY ASSURED: Exceeds industry security standards with over 250,000 test cycles completed. This rigorous testing ensures long-term durability and consistent functionality under frequent use HEAVY DUTY MATERIAL: Constructed from corrosion-resistant aluminum alloy for lasting performance. It features a polished finish that enhances scratch and wear resistance while maintaining a sleek appearance REVERSIBLE DESIGN: The versatile square door knob fits both left- and right-handed doors. This universal design eliminates the need for different handles based on door orientation, offering maximum flexibility DIY-FRIENDLY INSTALLATION: Compatible with standard door thicknesses of 1-3/8" to 1-7/8" (35mm to 48mm). The adjustable latch fits 2-3/8" or 2-3/4" (60mm