Feature: 1. 12Pcs: There are 12 pieces brushes in the package of different sizes, you can use them according to your actual needs, very practical! 2. 1/4 in Hex Shank: Comes with a common 1/4 hex shank, these brushes can be used for any electric drill or mold grinder. 3. Thorough Cleaning: These cleaning brushes are made of stainless steel, brass, steel and nylon, which are sturdy and durable, and can thoroughly clean the rust. 4. Easy Carrying: Comes with small size and lightweight, you can easily take these brushes with you to help with your work, very practical! 5. Wide Application: These brushes are suitable for cleaning or derusting in automotive, manufacturing, machining and grinding applications. Specification: Item Type: Bore Brush Material: Stainless Steel, Brass, Steel Product Size: Length: Approx. 4in / 10.16cm Brush Diameter: Approx. 8mm / 0.31in, 10mm / 0.39in, 12mm / 0.47in, 15mm / 0.59in, 17mm / 0.67in, 19mm / 0.75in Product Classification: Brass wire brush (yellow), steel wire brush (silver). Package List: 12 x Bore Brush