Steel Door Flush Door Type 1 Lock Type Cylindrical Material 18 Gauge Steel Hand Non Handed Thermal Insulation U-Factor 0.16 Door Opening Height 84 in Door Opening Width 36 in Thickness 1-3/4 in Agency Compliance UL Fire Rating For Use With Frames 3KY82 3KY83 3KY74 3KY75 Includes Polystyrene Core Closer Reinforcement Channel