... various sheet3) Surface treatment: kinds of plating(Zinc,Chrome,Tin...),Powder,Heat treatment,phosphating; ... .etcFinishPolishing; Anodize; SandingPowder coating; Vacuum Plating; Tin,Silver plating,zinc/nickel/chrome plating, hot galvanized, painting, PVC powder coating ... , dichromate plating,ect.Tolerance+/- 0.001mm ...