The''blow-back'' start comes without interference and is safe and ideal for general use. Friendly to the surrounding electrical machines and human health. Pilot arc technology allows you to cut without touching the tip to the metal. Hold the tip of the torch just barely off the metal which allows for smoother cuts and increases the life of the consumables on your cutting torch.It makes cutting expanded steel a lot easier and smoother. Length: 4 meters (13.12 feet). Interface size: M16 × 1.5.