The Lowe 159 full mortise storeroom lock is available in 2-1/2”, 2-3/4”, 3-3/4”, 5” or 6” backsets. Typically used as a storeroom lock or as an entry lock in conjunction with an electric strike. From the outside the 159 maintains a locked position always requiring a key to enter. From the inside free egress is always available. The lock can be configured at the factory to be used with knobs, levers, thumb latches or any combination thereof. It is supplied with a strike plate and stamped metal dust box, and the faceplate has an adjustable bevel. Center dimension between the handle and cylinder is 3-5/8”. The 159 is ANSI Grade 1, and is UL listed with a 3 hour fire rating. Available in all finishes.