Concoa / Airco 854-6405 164 Size 5 Tip Cutting TipFor Acetylene With 6 Very Heavy Preheat Flames This makes the Style 164 an excellent choice for cutting heavy scale and painted carbon steel or cast iron often found in scrap yards and shipyards.Cuts Up To 4"822-4790, 822-4890, 822-5790, 822-5890, 822-9086, 822-9066, 822-9076, 822-9516OLD AIRCO PART NUMBER 0854-6405. OLD CONCOA PART NUMBER 1854-6405.