It is convenient because it does not become jammed with the size that it fits snugly into the pocket when carrying around with outdoor welding.
In gas welding, it is useful because cleaning is a waste so that high pressure of the crater passes.
Although it may not be the original usage, it could be used to clean the carburetor of the engine of a haulage machine of about 3 horsepower. It is easy to store and carry since it is in the case. I am happy that the price is reasonably bargain.