This ansi grade 3 tulip knob passage lock set complements both traditional and contemporary residential interior doors. This set has no thumb-turn lock, ensuring easy opening of doors which never need to be locked. The backset is adjustable between 2-3/8 inch and 2-3/4". this lock set is made to fit doors between 1-3/8 inch and 1-3/4". it features a dead latch style backset and a square corner striker. The us15 Satin Nickel finish is protected by a clear powder coat finish. The excellent craftsmanship is backed by steel harbor's limited lifetime warranty.