The Lowe 139 full mortise patio lock is available in 2-1/2”, 2-3/4”, 3-3/4”, 5” or 6” backsets. The 139 is typically used to secure patio doors and other exterior doors that do not require a key. The 139 features 1” reinforced deadbolt, full egress functionality and can also be used where a privacy with egress function is needed. 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 thumb turn is 2-7/16”. The 139 is ANSI Grade 1, and is UL listed with a 3 hour fire rating. Available in all finishes.