This black finish 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 7/8 inch low height extruded aluminum inside handle with an anti-lift feature on the hook latch which has a 7/16 inch profile. The outside handle is a low profile non-keyed extruded pull. It can be keyed by installing Prime-Line part E 2071.