Left Handed Boulder Single Cylinder Sectional Entryset with Interior Lever This Entryset fits left/right hand active door. This entry set is locked and unlocked by a key from the exterior while a thumb turn on the interior serves the same function. Emergency egress allows the door to be opened from the inside without unlocking, while the outside stays locked. Made of solid forged brass for maximum strength and durability. Latch is constructed for exceptional durability and smooth operation. They are reversible to accommodate all door conditions. All latches are supplied standard with a full lip strike. Deadbolt and latch bolt are constructed of solid brass for strength and security! Concealed mounting system means that there are no fasteners visible to accumulate dirt and debris. Backset is Not Adjustable, Please Specify