NM Type Nozzle: Much safer, virtually no backfire due to mixing of gases in the 3 seat nozzle only. Making chances of backfire/flashback very remote. Angle Head: Forged from brass rods - much stronger and longer life. Tubes for O,& Fuel Gas: Seamless Stainless Steel. Lever for Cutting Oxygen: Stainless steel Lever, positioned for convenient hand ling by operato r. Provided with a Latch Facility to avoid operator fatigue. Filter: S.S. Filter at inlet (oxygen side). Handle: Metallic instead of plastic - longer life, much better appearance and grip. Knobs: Metallic - better grip, longer life.