Product Description. Stainless Steel Bore Brushes with Handle:Color: SilverMaterials: Stainless SteelBrush Diameter: 8 mm, 10 mm, 12 mm, 15 mm, 17 mm and 19 mmLength: 4 inchDon't turn counterclockwise or exceed 600 rpm.meant for push, pull motion and clockwise use only.You could mount the brushes with hex shanks on a corresponding driver handle, drill or die grinder.Widely used for dusting, rusting, decaying and polishing tubes, ports and bearings, allowing you to clean your kitchen, car or machinery thoroughly.Also suitable for cleaning,polishing,painting or rust removal in automotive,fabrication,machining,smiting and other applications. The twisted wire increases cleaning action. Each brush is fitted with a 1/4 Inch hex shaft for use with a standard 1/4 inch driver handle.Cleaning Brushes:Color: black brushLength: approx. 4.33 inches/ 110 mmDiameter:3 mm,4 mm, 5 mm, 6 mm, 7 mm.Quantity: 5 piecesThese cleaning needles and brushes are useful to clean small orifices such as -jets, nozzles, tools, camping stoves, and so on.Cleaning needles:Feature: stainless steel wire winding; And wire winding size: 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mmColor: silverLength: approx. 4.33 inches/ 110 mmQuantity: 10 piecesPackage Contents:6 x Stainless Steel Bore Brushes with Handle5 x Cleaning Brush with Key ring10 x Cleaning NeedleOnly 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.