Aluminum Sign Blanks 1.Drawing or Sample is available ... OEM machinery components, including Gears, Stamping Parts and Forgings.Aluminum Sign BlanksShape:rectangle, square, diamond, octagon, pentagon, triangle ... and so on.Chemistry: aluminum 3003 H-18. Material must be Alodined/Alodized per ... manage the customs clearance and inland transportation. Aluminum Sign Blanks