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Interior Pack (Double Cylinder) Function: Interior packs include the interior side of the deadbolt and a knob or lever for the inside of the door. They are required where a handleset does not specifically come with the interior knob or lever mechanisms. Double cylinder locks are keyed on both sides of the door and can only be locked and unlocked via a key. Please check local codes before installing. Left Handed: Handing is determined by standing on the outside of a room, facing the door, and noting on which side the door hinges are located. This handle is left handed, and so when standing outside of the room and facing the door the hinges will be on your left. Lido Left Hand Double Cylinder Interior Pack with Smart Key Cylinder used for left handed applications. This is the interior set only and is used in conjunction with Kwikset exterior handlesets. Deadbolt operated by key both sides. Key it Yourself: Lock is rekeyable by using the included learn tool in less than 30 seconds without removing the lock from the door. Lifetime mechanical and finish warranty Images may be shown without SmartKey cylinder Compatible with Left Handed Doors ONLY Decorative Rose Exposed Screws Easy Installation Smart Key Cylinders are 5-pin, and will not key alike to 6-pin cylinders. Images shown without deadbolt SmartKey®: This technology allows you to re-key your lock in seconds with 3 simple steps and features stainless steel racks, pins, and side locking bar for increased strength and security.