Turbotorch 0386-0170 ST-1 Extreme STK Torch Tip. Part # 0386-0170T. TurboTorch has developed a new series of hand torches that also feature Extreme Swirl Technology. The Extreme series generates more heat than other hand torches for faster brazing times and less gas consumption. All Extreme series hand torches and tips feature TurboTorch swirl combustion. Higher heat levels, in a short amount of time, enable the pros to quickly complete the job. Turbotorch ST-1 Features: Swirl combustion tip design. Provides maximum heat. Reduces Brazing time by 30 percent. Easy to clean orifice. Interchangeable tips. Turbotorch ST-1 Specifications: Propane: Sold Solders: 1/8-1/2 inch, 3-13mm. Silver Brazes: 1/8-3/8 inch, 3-10mm. MAPP: Soft Solders: 1/8-3/4 inch, 3-20mm. Silver Brazes: 1/8-1/2 inch, 3-13mm.