... matter on design, material or workmanship.best sell steel Door Standard Features 1. Steel sheet of door panel: 0.7mm cold ... this kind of lock is safe.7. Hinges: galvanized steel hinges (external hinge,opening 180 degrees,interior hinge,opening 90 ... , the door surface via acid cleaning phosphorizing antirust processing with heat transfer-printing on surface, looks like the natural wooden grain ...