[Multi Specifications]You will 10 pcs different sizes of wire stainless steel bore brushes with 4-inch in length.Diameters are 8mm,10mm,11mm,12mm,13mm,15mm,16mm,17mm,18mm and 19mm.Each brush has 1/4 inch hex to be mounted on any power drill or die grinder (not included) [Professional Design]The wire cleaning brush is practical and designed for easy access into confined areas and narrow holes,which can be applied for tubes,ports,bearings,cylinders or other narrow areas that require cleaning [Portable & Easy to use]The 1/4inch hex of these wire bore brushes is definitely easier to use than those screw type shanks. You can mount the brushes on a power drill or die grinder,or on a corresponding driver handle for more efficient cleaning [Wide Application]You can keep wire bore brushes in your,car,garage,kitchen and office.The bore brushes are suitable for cleaning,polishing,painting or rust removal in automotive,,machining,smiting and other applications. [Wire Brush Tips]Please note that these wire bore brushes are for -pull operation only.' turn counterclockwise and 600 rpm when using the power drill or die grinder. Pay attention to the use of these brushes, in order to prolong the service life color:Silver Material:Carbon steel Package Contents: 1 set x wire brush Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.