Gas torches are come in various different sizes and styles, but all provide a similar function, a controllable, adjustable flame.
Gas, under pressure, is release into the torch and when fuelled with oxygen, can be ignited and produces a flame. The temperature and volume of the flame can be controlled to produce more accurate flame.
The most common gas used with these type of torches is the MAPP gas as it burns at higher temperatures.
Manufacturers: Draper, Rothenberger, Silverline, Taymar, Primus Sievert