A unique metallic tool used mostly in the fabrication sector is the gas cutting nozzle. Preheating the metal to be cut to its ignition or melting temperature is its primary purpose. Additionally, the nozzle makes it easier to deliver oxygen gas, which combines with the heated metal to create a chemical reaction that releases more heat and aids in the removal of molten slag. Usually located near the tip of an oxy-acetylene torch, which is frequently used to cut steel and other metals, is this mechanism.