Ceco hollow steel flush door, cylindrical prep, steelcraft hinge, 18 ga, 36"w x 84"h hollow metal steel door with honeycomb core, 3 hour fire rating, 18 gauge, cylindrical lock prep, thermal insulation u factor 0.41, non handed, includes closer reinforcement, hinge locations from top of door, 7-3/8", 39-5/16", 71-1/4", lock prep location from top of door, 42-7/16".