Water hardened carbon tool steel, SK3 (content ratio of carbon, 1-1.1%), for taps, dies, chisels, etc. SK5 type (content ratio of carbon, 0.8- 0.9%) tool steel is for stamping plates for letters and figures or as saw blades. Annealed and processed for the easiest machinability. Supplied in standard length of 5.5 M. If you require a length other than the standard mentioned, please specify when ordering.