... 4)Certifications: ISO9001 Professional OEM parts supplier in machining parts,machining parts Material:cold & hot rolled steel ... , galvanized steel, spring steel, stainless steel, aluminium alloy, brass, copper partsSurface Treatment:RoHS Z/P ... , Y/Z, Cr, Ni, HDG, anodizing, powder coating, painting, decromet, brush, hand polishing machining parts ...