Dual Safety - The matte black exterior door knob is suitable for locking two sides of door, with one side locked by a turn-button and the other by a key, making it the superior solution for building a secure environment. Door Compability - Adjustable latches fit 2-3/8" (60mm) or 2-3/4" (70mm) back sets, and the entry door lock set fits 1-3/8" (35mm) to 1-3/4" (40mm) thickness doors, meeting your requirements. Premium Material - Crafted from heavy-duty and rustproof zinc alloy and boasting ANSI Grade 3 certification, this door knob with lock and key is built to last, being the ultimate choice for those who value durability. Modern Design - Feature a perfect matte black finish, our deadbolt lock and door knob set provide a simple yet stylish touch to your home or commercial area. Easy to Install - The deadbolt locks for exterior doors is easy to assemble with just a screwdriver, and the installation process is quick and user-friendly, saving you time and effort.