m303BÖHLER M303 is a pre-hardened martensitic chromium steel with very hh toughness, wear resistance and machinability. It is suitable for tools processing corrosive moulding compounds, e.g. PVC, and for food and beverage contact.I completed this course in 2016 and achieved a grade 2 pass. It's a very tough course, in my opinion. You should have completed M208 (or its equivalent) recently prior to starting M303 in