【Entrance(Different Key)】 It is locked/unlocked by a key from outside, and by thumb turn button inside. For more than one piece lock, they come with different keys, NOT keyed-alike.This Commercial lock set is for exterior door when entrance security is needed 【Intended for Commercial】This door lock id only for COMMERCIAL USE, NOT FOR RESIDENTIAL– NEWBANG HARDWARE Commercial door levers are usually used on door of large traffic facilities such as Schools, Hospitals, Libraries, Hotels, Airports, Government Buildings, Retail,Multi-Family Buildings, Condos; and also, you can use it for replacement and upgrading 【Certification&Qualify】 UL LISTED , which ensures the reliability and durability of the product. And fire Rated up to 3 hours. 【NON-Handed】Fits both left and right hand doors, the handle is reversible. 【70mm Backset】Fit door thickness from 1-3/8 inch to 1-3/4 inch. If you need 60mm backset, please email us, and we can make it come to you within 3 days.