We are a small business based out of Tennessee. Our tools have helped hundreds of owner-operators, independent dealers, and truck shops across North America. Our most popular product is the DD13/DD15 tool. It was created by the owner of Diesel-Tools, Todd Gass. He created the DD13/DD15 tool to fix a problem he constantly saw in truck shops. While it may seem expensive, the tool pays for itself after only one use. Therefore there is an immediate return on investment.