Black, Pull & Keyed Locking Unit for Sliding Glass Doors, Provides A Better Grip When Opening Door From Outside, Eliminates Need For Mortising Key Cylinder Into Door Stile, Will Accommodate 7 Different Hole Spacing Patterns, The 3-15/16" Hole Spacing Is Designed For Use Mortise Lock Installations Using Adams Rite & W&F Mortise Locks, Spacings Allow Application To A Variety Of Handle Sets, Includes 1 Outside Pull, 1 Locking Cylinder & Installation Fasteners.