3 types 9 pieces: -This value pack includes 3 different types of wire brushes for drills (cup, wheel and end brush). 9 wire brushes in 1 pack, great value, only suitable for power drills that can hold 6mm Durable: Our drill wire brushes can last 3 times longer than most of our competitors because they are made of high quality corrosion resistant brass with thickened and denser wires Superb polishing effect: Due to the good uniformity of the brush shape and the strong heat dissipation of the wire, the polishing effect is great. Polishing brush for drill Very easy to mount and dismount on the drill Wide applications: This drill bit set can be used on many different objects, such as flat, curved or uneven surfaces. They are best for polishing metal, polishing wood, removing rust from metal, or cleaning kitchen utensils