Radnor 17-12-R refers to a specific model of air-cooled TIG welding torch, part of Radnor's reliable welding equipment line, featuring a 150-amp capacity, a 12.5-foot cable, and often a rigid (R) or flexible 60-degree head (like 17FV-12-R or 17V-12-R), designed for light to medium-duty TIG welding tasks in fabrication or automotive work, with variations like built-in gas valves. New