... 0.15mm - 2.3mm thickness 8mm-300mm width blue,white,yellow,black,polished Hardened and tempered steel ... 2.5mm thickness 8mm - 300mm widthSurface finished: bright,white,blue, polished, yellow, blackHardness: 40-55HRC for hardened and tempered ... laboratory testing.Factory, for quality assurance, is equipped with Rockwell tester, tensile testing machine and mechanical and chemical testing etc., ...