The Hardin Micro Torch is a precision, lightweight instrument that Welds, Brazes and Solders. The torch is used in Jewelry Design and Repair Work, Opticians, Electronics, Glass Work, Model Making,Plumbing, Metal Crafts Sculpture and for Home projects. The Hardin welds an unlimited range of materials, brazes and solders the tiniest elements with ease, yet produces enough heat to weld steel up to 1/8" thick or melt 3 oz. of silver. The Hardin Micro Torch is the perfect precision flame instrument for the Jeweler, Homeowners and tradesman who demand accuracy and reliability; the Artist who needs a variety of flame patterns and heat ranges and the Do-It-Yourselfer who needs to make some quick, easy home repairs. - The Hardin Micro Torch hose assemblies have standard size "B" 9/16" welding hose type connections and will attach to most industrial welding gas regulators. - This lightweight, precision crafted Hardin torch lets you work easily and precisely in small areas with a stable flame up to 6500F. - The Hardin Micro Torch may be operated with most commercially used welding gas including; Acetylene, Propane, Hydrogen, Propylene, Butane, Mapp®. It may also be used with city gas (natural gas) at a minimum pressure of 1 psi at the torch.The Hardin Micro Torch can be used with acetylene or hydrogen. Tip sizes 1 and 2 can not be used with LP gas i.e. propane, propylene, Mapp, butane or natural gas. Sizes 3 through 7 may be used with any fuel gas. Note: Oxygen is required for use with all Hardin Torch tips as well.