For keyed exterior doors. Exterior knob locked or unlocked by key. Unlocked by turn piece on the interior knob. Triple option latch includes: 1/4" round corner, square corner, and 1" circular drive-in latch, adjustable backsets 2-3/8 In. or 2-3/4 In. Strike: 1/4" round corner and square corner full-lip strike. Lifetime mechanical warranty. 10 year finish warranty. Bright brass (605) finish.