What will receive: there are stainless steel cleaning brushes and brass cleaning brushes with different sizes, all of them have 1/4 inch hex shank, enough for your need in common wire brush applications Scientific design: bore brush offers easy access into narrow holes and confined areas, designed for use on right angle grinders; Industrial wire brushes are suitable for cleaning steel parts, machinery, the unfinished metal parts, paint stains, corrosion without damaging surfaces or fine features Quality material: bore cleaning brushes are made of stainless steel and brass copper, strong and durable, can clean rust and detail completely; Twisted wire is for increased cleaning action Specification details: the drill wire brush is 1/4 inch hex shank fits for power drills, impact drivers, die grinders, the overall length is 4-3/4 inch, different width includes 16 mm, so you can choose the right size to use according to your needs Multiple application: you can keep wire bore brushes in your car, garage, office and kitchen, and the bore brushes are suitable for cleaning, polishing, painting, or rust removal in automotive, fabrication, machining and smiting applications, and a lot of others Colour: Silver+Gold Material: Stainless Steel Size: 5/8 inch Package Contents: 6 x stainless steel hole brushes 6 x brass hole brushes Only the above package content, other products are not included. Note: Light shooting 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.