Steel quality is the summation of how well a steel meets its specified chemistry, the cleanliness of the steel or degree to which it is free of impurities or inclusion, homogeneity of the microstructure, grain/carbide size and in some instances if it meets the mechanical requirements for that particular steel. In the design and manufacture of tablet compression tooling, nothing is more important than the quality of the materials being used. The best manufacturing principals maintaining the tightest tolerances will result in tool failure if the initial material quality is poor. Material quality is the fundamental building block upon which all successive value added steps are laid. The majority of all tablet compression tooling is produced from steel and steel quality is the subject of this article.