For keyed exterior doors. Unlocked by key from outside when outer knob is locked by turn-button in inner knob. Triple option latch fits square corner, radius corner, or circular drive-in applications. Universal backset latch for 2-3/8″ or 2-3/4″ backsets. Surpasses all ANSI Grade 2 requirements. Exceeds ANSI Grade 2 crush resistance standards. Compressible cylinder with removable cap. Door range: 1-3/8″ to 1-7/8″. Lifetime mechanical warranty.