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 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 You can keep wire hole brushes in your car, garage, and kitchen, these hole brushes are suitable for cleaning, polishing, painting or rust removal in automotive, manufacturing, machining and stamping The 1/4inch hex handles of these wire hole brushes are definitely easier to use than those -on handles. You can mount the brush on your drill or die grinder, or on the corresponding drive handle for more efficient cleaning 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, Weight: 0.83114272774 Pounds, Manufacturer: Hopbucan