What's Included in our Metal Door Unit Package - 90 Mins Fire Rated, Hollow Metal 20 Guage Door - 16 Guage Knockdown Drywall Frames, typically used for a sheetrock wall applications - (3) 4 1/2" x 4 1/2" UL listed self closing hinges -Cylindrical Lockset Actual Door Size Door Hinge Locations Door Center Lock Location Steel Door Specifications Insulated with honeycomb core Galvannealed (standard) Seven gauge hinge reinforcements Reinforced 161 lock prep Meets ANSI standards Universal 4-1/2" hinge prep Made in the USA Inverted top and bottom channel Best Value For Security Universal hollow metal doors are ideal for security doors. Unlike wood or aluminum glass doors, steel doors provide more security and durability. Wood doors often crack, and storefront glass doors are vulnerable to broken glass. If your commercial building is in an area subject to abuse or break-ins, the Universal commercial steel door is your best option with the best value. Heavy-duty door construction and frame are much more durable than aluminum or wood. Steel doors also have a much higher impact resistance than commercial wood or storefront doors. Energy Efficient Our hollow metal steel doors come standard with an insulated honeycomb core. This core type helps retain your commercial building's energy.