1.DOUBLE CYLIDNER DEADBOLT: The lock set has double cylinder deadbolt, and it could be locked and opened by keys from both side. For use on exterior doors where keyed entry and security is needed,such as office. 2.UNIVERSAL HANDING: Door knob has universal handing, fits both right handed and left handed doors. 3.STEEL ADJUSTABLE LATCH: The door lever set fits doors with a thickness of 1-3/8 inch to 1-3/4 inch (35mm to 45mm) and is equipped with an adjustable back set of 2-3/8 inch or 2-3/4 inch (60mm or 70mm). 4.HEAVY DUTY DOOR KNOB:Rich satin stainless material keeps door knobs more durable.Certification: ANSI Grade 3, Exceeds 200,000 cyles 5.PREMIUM STYLE:The ball vintage design can match different decoration styles of the house.Ergonomic design, comfortable to hold, easy to operate.