1.The majority of this commercial door lock is made of corrosion-resistant aluminum, featuring in high strength, and the lock cylinder made of solid brass, much safer and reliable than zinc alloy lock cylinder. All of these features ensure the safety and longer lifespan 2.This storefront mortise door lock features in huge five-ply laminated steel bolt with concealed hardened steel pin, ensuring maximum safety 3.EASY TO INSTALL & USE: Make sure the backset is 1-1/8 in (measured from door edge to the center of lock cylinder.) and the lock body fits the groove on the side of the door. 360° turn of the key or thumb-turn retracts or extend the bolt, providing maximum security and strong anti-theft performance 4.WIDE APPLICATION: This s.