Suitable Material Ceramics / glass, tool steel / alloy steel, resin / rubber, cemented carbide / cermet, general steel / stainless steel, aluminum / copper Technical Data: Maximum Operating Speed (min -1 [rpm]) 15000 Shank Diameter (Φmm) 2.34 Overall Length (mm) 49 Mass (g) 22 Bristle Length (mm) 5 Trusco Part No. 499-2121 Outer diameter (mm) 5 Material of Bristle Horse hair