Users of tools seldom know or understand how or why a tool is designed a certain way. They are so concerned with the result of the work, that they don't consider the process itself.In this primer all of the American makers of gunsmithing reamers, gauges and other tools have come together to answer the questions that every gunsmith should know the answer to. Understanding tools will increase your efficiency and the quality of your work. Making you more money and making clients happy...