This mortise lock is constructed of steel components with rounded faceplate ends. It features an adjustable, spring-loaded hook latch projection, and it can be used on sliding patio doors constructed of wood, aluminum and vinyl. This lock works with mortise style, surface-mounted patio door handle sets with 45 degree angled keyway positions when in the locked position. The mounting hole centers of this lock measures 5-3/86 inch from center to center, and the rear housing corners are secured with mounting holes that are 3-15/16 inch on center.