The Master Lock No. RU0103KA4S features a rusk-style knob with six-way adjustable latch to fit all doors with 2-3/8in or 2-3/4in backset, square, rounded corners, or drive-in. This knob offers ANSI Grade 3 performance for exterior locking applications. The polished brass 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.