The Machinists Reference Lot includes trigonometry tables, Lufkin catalog, and decimal equivalents, as well as hardness tables. Making it a valuable resource for machinists and metalworking professionals. The Lufkin brand is known for producing high-quality tools and equipment in the field of metalworking, ensuring that the information provided in this reference lot is reliable and accurate. With this lot, machinists can easily access essential information for their work, making it a practical and essential addition to their tool collection.