Item Type: Bore Brush Set <br>Shank Material: Stainless Steel <br>Size: <br>Brush Length: Approx. 100mm/4in <br>Brush Diameter: Approx. 8mm/0.31in, 10mm/0.39in, 12mm/0.47in, 15mm/0.59in, 17mm/0.67in and 19mm/0.75in (2 pcs each) <br>Hex Shank Size: Approx. 6.3mm / 1/4in <br>Extension Rod Length: Approx. 15cm/5.9in<br>1、6 Specifications: The pack contains 6 kinds of bore brushes with different diameters to meet your different cleaning needs, and there are two of each diameter for replacement. <br>2、Hex Shank: Each bore cleaning brush has a standard 1/4 inch shank, which can be connected with a hand drill or an electric drill for more efficient cleaning. <br>3、Ease of Use: Excellent wire brush can thoroughly clean rust and details, and twisted pair design enhances cleaning effect. <br>4、Premium Material: The shank is made of stainless steel, which is resistant to rust and corrosion and has long term stability in harsh environments. <br>5、Multiple Applications: The hole brush set is suitable for cleaning and rust removal in home, automobile, manufacturing, machining and grinding applications.12 x Bore Brush Set<p>1 x Extension Rod</p>