Security Double Doors Door Type 1 Lock Type Cylindrical Material 18-Gauge Steel Hand LHR Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 96 in Thickness 1-3/4 in Agency Compliance UL 3 Hours Fire Rating For Use With 3TGE1 3TGE3 6-5/8 in 39-5/8 in 72-5/8 in 40-15/16 in