Capable of polishing the bottom surface and the side surface at the same time.Attached to a rotating tool such as an automation machine or drill press for use.For rust and dirt removal of various metals, cleaning before and after welding, and polishing of the bottom and inner diameter of cylinders.Working tool: electric drill, drill press, etc.Wire Diameter (mm):0.3Bristle Material:Steel WireOuter Diameter x Bristle Length x Shaft Length x Shaft Diameter (mm):30 x 25 x 35 x 6Max Working Rotation Speed (rpm):3000Shaft: SteelAir tools cannot be used.Please use below The maximum working rotation speed. Please wear protective equipment to use safely.