The Master Lock No. DSH0615KA4S 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 1 performance for exterior locking applications. The satin nickel finish provides a sleek appearance. Operates with SC1 cylinder. The 25 Mechanical 5 Finish Warranty provides peace of mind from a brand you can trust.