1'' jig-saw 3/16'' steel body. Concrete fireproofing in door 4x more fire resistant than drywall. Internal release spring loaded. 14 bolt locking system independent. Internal release spring loaded. 3/4'' protector frame sheilds bolts. 1/2'' hardplate in door. U shape internal reinforcements creates added strengths. Black semi gloss finish. 5 Prong spindle wheel. Two relockers brass arm and barrell. Silver or gold pin striping. Sargent and greenleaf combo lock optional LG digital lock quick access. Body continues welded in and out. Double expanded gaskets and bolt down kit. In ward swing or outward swing doors. Vents with 1/4'' steel protective hats, protects vents from falling debris. 1'' solid steel hinges. American Made!