Guard 1997GLSS Satin Chrome US26D Always Locked Vestibule Storeroom Commercial Cylindrical Lever Lock Set Lockset. Schlage SC1 Keyway 3 keys. Adjustable 2-3/8" or 2-3/4" backset (Backset is all metal!!! as can be seen in picture), interior Lever turns free, key outside, For Use On Interior Or Exterior Wood Or Metal Doors, 1-3/8" To 1-3/4" Thick. Finish: Satin Chrome US26D. Type: Commercial. Grade: 3. Function: Storeroom. Keyed Different. Keyway: SC1. Adjustable backset. 5 pin solid brass cylinder. Internal mechanism heavy gauge cold rolled steel. Positive push and turn button locking mechanism. 3" threaded rosette outside. Panic proof mechanism. Concealed mounting screws.