The hole cleaning brush is made of stainless steel, which is strong and durable, and can thoroughly clean rust and fine details. The brush set of three is made of stainless steel, copper and nylon, which is not easy to break and more durable. Less chance of rusting when cleaned and polished. [The wire is 1/4inch hex , suitable for electric drill, impact driver, die grinder, including 8/9/10/11/12/13/14/15/16/17/19/20/22/25 mm, so you can choose the right size to use according to your needs. The hole brush easily gets into tight holes and tight areas, designed for right angle grinders. Industrial wire brushes are Perfect for cleaning steel parts, machinery, unfinished metal parts, paint stains, corrosion, without damaging surfaces or fine features. 14 sizes of hole cleaning brushes reach tight holes and tight areas with ease. You can choose the brush size you need to clean kitchen sink drains, machine holes, paint stains or fine features without damaging the surface. Colour:silver Material:Stainless steel Package Contents: 14 x Wire Bore Brush 3 x copper wire Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.