This quality sliding door handle set offers easy replacement for most sliding door hardware. Handle mounting holes are spaced at standard 3-15/16”, center-to-center. The interior thumb latch is located in the offset position at 2-5/8" below the upper handle mounting hole (this is the usual configuration for a 4-hole mount door). This complete set includes inside and outside handles, mortise lock and strike, key cylinder and keys, thumb latch, and mounting screws. All-steel mortise lock will withstand forced entry loads of 1000lbs, is zinc plated for corrosion resistance, and includes removable adapter plate and surface-mounted keeper / strike. Handle sets are available for right or left handed doors. See door handing photos to determine handing needed. Please also see handle and mortise lock dimension photos to insure fitment.