Steel Door Flush Door Type 1 Lock Type Mortise Material 18 Gauge Steel Hand Non Handed Thermal Insulation U-Factor 0.16 Door Opening Height 80 in Door Opening Width 36 in Thickness 1-3/4 in Agency Compliance UL Fire Rating For Use With Frames 3KY80 3KY81 3KY72 3KY73 Includes Polystyrene Core Closer Reinforcement Channel