This general purpose steel brush is for scrubbing nearly anything off of the metal parts of your coffee equipment. It's ideal for cleaning off tough mineral buildup, oxidation, scalded milk, and miscellaneous residues from STEEL fixtures in your espresso machine. Note that Steel is HARDER than Brass, so the Steel Brush should not be used on the brass parts of your espresso machine.
The brush is 7.25" long, has a sturdy plastic handle, and is for general use on Steel parts in your coffee equipment and espresso machines. See our article on Cleaning an Espresso Machine for more on this.