You get 24 stainless steel bore brushes, 6 different sizes of twisted pair stainless steel bore brushes, 4 inches in length. Available in 8mm, 10mm, 12mm, 15mm, 17mm and 19mm diameters. Each brush has a 1/4inch hex shank to mount on any power drill or die grinder (not included) Wire cleaning brushes are practical and designed for easy access to tight areas and narrow holes, can be used on pipes, ports, bearings, cylinders or other narrow areas that need to be cleaned The 1/4inch hex handles of these wire hole brushes are definitely easier to use than those screw-on handles. You can mount the brush on your drill or die grinder, or on the corresponding drive handle for more efficient cleaning You can keep wire hole brushes in your car, garage, office and kitchen, these hole brushes are suitable for cleaning, polishing, painting or rust removal in automotive, manufacturing, machining and stamping Note that these wire hole brushes are only suitable for push and pull operations. When using a drill or grinder, do not turn counterclockwise and do not exceed 600 rpm. Pay attention to the correct use of these brushes in order to prolong the service life Colour:Silver Material:Stainless steel Size:4 inches in length Package Contents: 24 x Stainless steel bore brushes(4 each for 8/10/12/15/17/19mm) Only 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.