Manufacturer Alarm Lock Model HW904DBL Handing Handed Backset 2 3/4 standard Door Thickness 1 5/8″ to 1 7/8.” Operation Classroom function Door Prep Standard ANSI A115 Mortise prep, modified by adding additional through-bolt holes ANSI/BHMA Durable BHMA Grade 1 Lockset Warranty 2 Year Warranty Weight 3.5000