- DURABILITY: This door knob is built to last, exceeding 200,000 cycles. It features stainless steel knobs combined with high-grade copper locks and keys, providing exceptional strength and a matte black finish that resists corrosion. - EASY INSTALLATION: With included scratch-resistant screwdriver, mounting screws, and clear instructions, installing this door knob is straightforward. No need for professional help – you can easily do it yourself and have your door secured in no time. - KEYED ENTRY FUNCTION: The door knob comes with three brass keys, making it ideal for both exterior and interior doors where security is paramount. Protect your home or office with reliable locking capabilities. - COMPATIBILITY: Features a steel adjustable latch with a backset of 2-3/8" or 2-3/4" (60mm or 70mm), accommodating all standard door thicknesses from 1-3/8" to 1-3/4" (35mm to 45mm). Note that the square plate of the latch is non-removable for added security. - USE SCENARIOS: 1. Perfect for securing exterior doors of homes and garages, ensuring safety without compromising style. 2. Ideal for interior office doors where restricted access is necessary, providing peace of mind in shared workspaces. 3. Great choice for rental properties needing reliable security and easy installation for tenants. This door knob combines functionality, durability, and aesthetic appeal, making it an excellent addition to any door requiring security and reliability.