... speed cutting blades and screw dies 2.Prompt delivery time F1/1.2414/SKS21 High Speed Tool Steel Steel Grade: W ... modify, F1, 1.2414, SKS21Chemical Composition(%)CSiMnCrVP/S≤WMo1.050.350.500 ... tool, like: punching mould, cold squeezing mould and circular saw. F1/1.2414/SKS21 High Speed Tool Steel