The Master Lock No. DSO0615 features a single cylinder deadbolt, with interior thumb turn. The deadbolt is four way adjustable for 2-3/8in or 2-3/4in backset, square, or rounded corners. The deadbolt offers ANSI GRADE 3 performance for exterior locking applications. The satin nickel finish provides a sleek appearance. The Ten Year Limited Warranty provides peace of mind from a brand you can trust.