You receive 40 pieces of extension rod wire brushes for rust removal, enough quantity to meet your and replacements. The diameter of the wire brush mandrel is 3mm, the diameter of brush is 6mm, and the length is 100mm. The cleaning end brush pen is made of material, which is sturdy and safe to use and not easy to wear or break. The extended shaft makes it easy to get into those hard-to-reach areas, and its shape makes it perfect for cleaning flat surfaces and into hard-to-reach places like slots. The wire brush has multiple functions. It can remove burrs, rust, dust, and oxide layers. It can remove burrs, rust, dust, and oxide layers. For use on items made of brass, copper, gold or other soft ferrous metals, such as tools, door handles, automotive parts and electrical contacts size: 3 x 6 x 100mm Material: Metal colour: As Shown Package Contents: 40 x wire brush 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.