This patio door handle is a surface with clamp latch style. Used exclusively by International Windows on their 950 series patio doors. It mounts on the door's inside frame and the clamp latch latches onto an extrusion (astragal) on the jamb. The clamp is unique due to its teeth like design. It has a 2-1/8 in. inside handle height. Mounitng holes are 3 in. on center. It is non-handed and can be used on either right or left handed doors. The outside handle is a non-keyed black flush mount made of extruded aluminum. Purchase Prime-Line part E 2000 to key this unit.