Features: 1Copper and Iron Material: Made with premium copper and iron material, including 6 copper brushes and 6 iron brushes, ensuring the durability and reliability. 26 Different Sizes: Includes 6 different sizes of bore brushes, 8mm/0.31in, 10mm/0.39in, 12mm/0.47in, 15mm/0.59in, 17mm/0.67in, 19mm/0.75in, to meet various needs. 3304 Stainless Steel Wire: Made with excellent 304 stainless steel wire, the bore cleaning brush is highly erosion resistant, sturdy, and difficult to bend. 4Excellent Polishing Effect: The steel wire brush head design can easily remove burrs on the surface of the pipe, resulting in a glossy and tidy pipe, practical and efficient. 5Extended Handle Design: Comes with an extended handle, making the brush easy to clean narrow or hard to touch areas, providing a wider cleaning range. Specification: Item Type: Bore BrushMaterial: Copper, ironWeight: Approx. 193g/6.8ozSpecification: 12PCS, 8mm/0.31in, 10mm/0.39in, 12mm/0.47in, 15mm/0.59in, 17mm/0.67in, 19mm/0.75in (6 copper brushes and 6 iron brushes) Package List: 12 xBore Brush