... etc.)they have different thickness(50mm,75mm,100mm), density, color, type, etc. b. Single color corrugated steel sheet( Steel Material: ... ect):They have different thickness( 0.3-0.7mm), color, type, etc. 5. You can choose freely the material of ... so many accessories, for example, steel bracket, bolts, self-taping screw, rivet, inter and outer cullis, rainspout, trimming sheet, glass cement, etc ...