1. oxygen-acetylene 2. oxygen-propane 3.brass 4.used for welding or cutting steel, and other gouging processing Welding torch ... torch5) K-4 gouging torchCutting torch features:1) GO2-250 used nozzles for British style cutting torches: ANM, PNM, ANME, PNME,AGNM ... , ASNM2) GO2-350 used nozzles for French style cutting torches: 10 / 10,16 / 10, 20 ...