Sliding Glass Door Mortise Latch/Lock, 3-7/8" Hole Center To Center, Aluminum, 45 Degree, Keyway, Round Faceplate, Overall Depth 1-3/16", Excellent For Either Wood Or Aluminum Door Applications, Integrated Keeper & Lock For Positive Anti-Lift Protection, Plated Steel Hook Is Mounted In An Anti-Friction Pivot, Encased In Aluminum Housing.