Extensions, terminations, and testing of the cable refers to a category of industrial products and services rather than a specific brand. These products are commonly used in the electrical and telecommunications industries, providing solutions for cable management, connectivity, and performance testing. Companies like Radwell International (USA) and Grainger (USA) offer a wide range of cable-related products, including extensions, terminations, and testing equipment, catering to industries such as manufacturing, automation, and infrastructure. These products ensure reliable and efficient cable installations and maintenance.