door hinge 1.various material 2.different surface treatment 3.OEM service door hingesize 76*51.5*1.6mm,zinc plated1) providing OEM service and according to customers demand2) material: iron,steel,stainless steel,copper and so on3) surface treatment: zinc plating,nickel plating,chrome plating and powder coating4) especial for zinc plated,for having our own zinc plating factory steel door hinge