Sturdy Black Square Knob with Key Cylinder and Latch for Residential Entry Door Lock

Sturdy Black Square Knob with Key Cylinder and Latch for Residential Entry Door Lock. High Security Lock Core: Solid lock core provides strong resistance against tampering and enhanced latch mechanism. Durable Zinc Alloy: Made from premium zinc alloy with corrosion-resistant finish for long-lasting strength. Silent Operation: Smooth mechanism tested over 200,000 cycles with no sticking for quiet operation. Reversible Design: Square lever handle is reversible for both left-hand and right-hand doors. Easy Installation: Standard 60/70mm adjustable backset fits most doors with all mounting hardware included. Low Maintenance: Fingerprint-resistant brushed finish stays clean longer with simple wipe-down cleaning. Versatile Application: Perfect for homes, offices, hotels, and commercial buildings with professional-grade security. CE and UL Certified: Products follow international standards such as EN/CE, UL, and ANSI for quality assurance.