View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.Jessop 259 is an extremely tough silico-manganese alloy tool steel with outstanding shock and abrasion resistance. It is recommended for shock resisting applications such as pneumatic tools, punches, concrete breakers, rivet busters, etc.