This black finish patio door handle is a surface mounted with hook latch. Often found on older style patio doors, it is mounted on the door inner frame surface and the hook latch engages the keeper mounted on the jamb. It has a 2-1/8 in. high extruded aluminum inside handle with an anti-lift feature on the hook latch. The mounting holes are 4-15/16 in. on center. The outside handle is a low profile extruded pull and is non-keyed. To key this unit order Prime-Line part E 2071.