Steel Door with Frame, Door Design Quick Mount, Lock Type Mortise, Frame Type 12 Gauge Steel, Fully Welded, Material 18 Gauge Steel, Hand LHR, Thermal Insulation U-Factor None, Door Opening Height 80 In., Door Opening Width 36 In., Thickness 1-3/4 In., Overall Depth 2-1/4 In., Agency Compliance UL Listed, 1.5 Hour Fire Rated, For Use With Pre-Existing Door Openings