STEP Tools, Inc. provides software and expertise to OEMs, machine builders, and CAD vendors to connect machine tools, product models, and simulation into real time digital twins for fast, correct manufacturing. Since 1991, we have worked with a worldwide community of experts to develop the ISO 10303 (STEP) protocols for sharing product model data between enterprises. Ove the years we have built a rich and powerful software stack for viewing, simulating, and manipulating measurable product and machining process models. In 2019 our software libraries were used to make over a million aerospace parts and are found in millions of CAD, CAM, and BIM stations.