1. Mexin security door collection is manufactured under the guidelines of National Standard GB 17565-1998. Mexin doors exceed each standard while seeking constant improvement. The door is designed for both residential and light commercial applications, providing security strength, and sound & heat insulation. 2. Fine quality steel or stainless steel construction. Insulating core poured over heavy gauge security screen. 3. Custom finishes available upon request. 4. Choice of lock functions. 5. Three quality Grades to choose from.