Security Double Doors Door Type 2 Lock Type Cylindrical Material 18-gauge steel Hand RHR Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 60 in Thickness 1-3/4 in Agency Compliance UL 3 Hours Fire Rating For Use With 3TGC3 3TGC5 4-7/8 in 37-1/8 in 69-3/8 in 42-3/4 in