About this item The of the pipe cleaning brush is designed to increase friction streaks, which is helpful for us to strengthen cleaning and achieve better cleaning results. :The stainless steel tooth marks on the inner side have a strong hardness and a strong to rust. material: and thick handle, high strength, strong durability, long service life, can resist the abrasion, tearing, impact, and flattening of bristles, it can clean unfinished metal parts, and not affect the or fine features Packing : you is 6 pieces of pipe cleaning brushes, including a 1/2 inch, 3/4 inch, and 1 inch; Each size has 2 pieces, which can be applied to clean pipes of different sizes Reasonable combination: in order to adapt to more sizes, we have combined 3 sizes of cleaning brushes and sold , so you can deal with the situation different sizes of pipes need to be cleaned at any time, and complete the cleaning work more effectively