Uniweld Type17-00 Weld/Braze Tip Proudly Made in the USA and 100% Flame Tested Can be used with acetylene, propane, MAP//Pro, and natural gas Capable of welding 3/64in of metal and brazing 1/4in of copper Fits the 71 handle or the WH550 handle Tip nut only requires hand tightening allowing for quick and easy changing of tips