Experience the DPI difference. Drill Pipe Inc. (DPI) is based just west of Minneapolis, Minnesota in Winsted, Minnesota and is a nation-wide manufacturer of quality drill tools. With over 60 years of experience, Drill Pipe Inc. has an experienced and dedicated team that has leveraged their experience and expertise, and combined it with the latest manufacturing technology to produce the industry’s highest quality in-hole tools. At DPI, we use the highest quality material, cutting edge heat treatment technology, multiple welding processes, CNC machine centers, thread gauges, and computer assisted design tools. Each step of our manufacturing process is closely monitored by our quality control personnel, who have a distinctive role in our business. A history of success proves it. We are devoted to working with our customers to understand their need for our product and create an approach that accomplishes the goals of their business. With our wide range of industry knowledge, we will dive deep and use a team approach to fulfill all of our customer’s needs.