Flower type brush which is easy to operate due to compact and high speed rotation, excellent in usability.Flower type, optimum for polishing cylinder inner diameter and bottom crossing hole.Working Tool: Variable speed type electric micro grinder.Wire Diameter (mm):0.15Bristle Material:BrassOuter Diameter x Bristle Thickness x Shaft Length x Shaft Diameter (mm):15 x 3 x 31 x 3Max Working Rotation Speed (rpm):10000Comments:Polishing of brass, copper products and alloy products.Shaft: BrassAir tools cannot be used.