This single cylinder deadbolt can be locked or unlocked by a key on the outside, or the turn piece on the inside.Standard duty -1 throwDoor thickness 1-3/8 to 1-3/4Features Kwikset Smartkey TechnologyCan be rekeyed in seconds to most existing 5-pin Kwikset pre-cut keysCannot be Master KeyedAdjustable backset fits 2-3/8 or 2-3/4Featuring SmartKey Security, which protects against advanced break-in techniques and allows you to re-key your lock yourself in seconds.