Cleans concrete. Ideal for work that emphasizes finishing. Uses abrasive materials made in Japan. Concrete, marble, beveling, and deburring. Granularity (#): 24. Outer diameter: 4.9 inches (125 mm). Blade length: 1.1 inches (28 mm). Hole diameter: 0.9 inches (22 mm). Maximum rotation speed: 1,000 m). Silicone carbide sharpener Please note that we will not accept cancellation after payment has been payed. COD Payment, Designate Delivery Time, and Store Counter PIckup are not available. Thank you for your understanding.