Most of the parts are made of galvanized steel, with higheranti-corrosion than normal cold rolled steel sheet.

The upper covers are fabricated by drawing die set, with muchhigher strength than welding process. lt also prevents thecorrosion of the joints caused by welding.

Steel handle installed with the lock, convenient for opening the door.

Wood grain of engineering plastic is a new kind of environ-ment friendly material,with superior weatherability and agingresistant, without deformation, depigmentation or clefts aftera long time of outdoor use.