EDENTA GRS 023-123 BLUE DIAMOND MEDIUM POLISH ROUND FLAT EDGE WHEEL 25 X 2MM MEDIUM BLUE POLISHER is for further smoothing the surfaces and preparation for final polishing. Optimal Speed - 5,000 RPM This wheel provides refined shaping for carbide and HSS gravers. Easily mounts in a micromotor (like NSK EVO or Electer) or flex-shaft (Foredom) hanging motor. Shank diameter: 2.35 mm. Wheel size: 25 x 2.5 mm.