This patio door handle is a surface with hook latch style. Often found on older style patio doors, it is mounted on the door's inside frame and the hook latch engages the keeper mounted on the jamb. It has a 1-1/8 in. handle height extruded aluminum inside handle with an anti-lift feature on the hook latch. The latch profile is 3/8 in. and the mounting holes are 4-15/16 in. on center. The outside handle is a low profile extruded pull. Unit is non-keyed but can be keyed by installing Prime-Line part E 2070.