... types one is TIN, another is steam treated. HSS Metallic Saw Blade : Blade has an Fe304surface coating flr a longer life, it is ... use a TIN co. Can choose different teeth: triangular tooth, curve tooth, right-left-tooth. Can choose its diammeter: 250mm, 275mm, 300mm, 315mm ... , 1.8mm, 2.0mm, 2.5mm, 3.0mm. HSS Metallic Saw Blade