Did you know that an estimated 4,800 residential burglaries happen daily in the U.S., and nearly 28% happen with a family member inside the home?? OMG! Secure spaces make for happy families and productive working environments. Get peace of mind with this enhanced double cylinder deadbolt lock. With pick & bump resistant Yale keyway profile for wood, aluminum, or steel doors. The interior and exterior sides require using keys to operate the bolt. So that a lock is not easily picked, pried off, kicked loose, or drilled out by a burglar, police & locksmiths recommend it should have a bolt at least one inch long and the keyed cylinder - the part the key fits into -should be pick-resistant if possible --- TOLEDO locks exceeds all these requirements. Approved by expert locksmiths. It is great for residential use and meets the American National Standards Institute requirements. Lock hardware is rekeyable and has 5 pin chambers, double KIK keyed alike cylinder function and it also includes X3 brass (Y-1/999) key duplicates. The core cylinder's top mushroom pins make any attempt at lock picking much more difficult. A strong steel through-bolt post is convenient to adjust for correct backset sizing (2 3/8" 60mm or 2 3/4" 70mm) with square faceplates. Designed for easy and fast door installation from (1 3/8" 35mm to 1 3/4" 45mm) thick. High torque resistance and enforced lock mechanism shields from wrenching force. This high-quality deadbolt Lock has been engineered for long years of dependable service in the harshest environments. ATTENTION: If you are not handy with lock hardware components, please consult with a certified locksmith. Revise your local building codes, as they may limit the use of double-keyed locks on main entrance doors in residential settings to ensure fire hazard safety. For significantly increased security, a door should have 2 deadbolt locks installed 36 inches apart.