Adjustable Hole Spacing: The outer handle hole spacing of this front door lock set ranges from 7-11/16 to 8-13/16 inches (195-224 mm). The adjustable hole spacing allows you to fine-tune the position of your door locks within a certain range. It also makes it easy to match with a new lock when replacing it, eliminating the need to redrill and ensuring a hassle-free installation. Sturdy and Durable: Our front door handle and deadbolt set is made of high-strength zinc alloy material and treated with surface copper plating, exhibiting excellent corrosion resistance and wear resistance. This means it can withstand long-term use, changes in humidity, and general wear and tear, extending its lifespan. Its smooth surface also resists dust and dirt buildup, making it relatively easy to clean and maintain. Individually Packaged: Each component of our front door lock set with deadbolt is individually packaged, providing separate protection for every part. This prevents friction, collision, or damage during transportation and storage and avoids scratches when unboxing. Additionally, it makes it easy for you to identify and assemble each component. Install with Ease: This front door handle is easy to install, and you don't need a professional door installer. Simply follow the 5 steps in the instruction manual: 1. Mark the door and drill holes; 2. Install the lock latch; 3. Attach the external handle; 4. Install the internal knob; 5. Attach the lock strikes. With just a screwdriver, you can complete the installation in minutes. Universal Handle: The reversible front door knob is suitable for both right-hand and left-hand doors, making it versatile for installation in various scenes, such as bedrooms, guest rooms, living rooms, and bathrooms. It provides convenient access and enhances privacy and security in your home, simplifying home safety.