The document discusses various materials used for making tools and fixtures, focusing on their properties and suitability. It notes that tool designers must consider adaptability, durability and economy when selecting materials. Key material properties discussed include hardness, toughness, wear resistance, machinability and brittleness. Common ferrous (iron-based) tool materials and their applications are also outlined, such as carbon steel for most tool construction parts due to its availability, versatility and low cost.