The diamond wheel produces a fine cut is very durable, does not break & retains its shape. Technical specification: Shank diameter: 3.2 mm. Working diameter: 22.2 mm. Usage: A unique accessory especially suited to cutting, grinding & filing materials that are harder than metal. For example concrete, marble, stone, porcelain, ceramic & hard epoxide. The diamond wheel produces a fine cut, is very durable, does not break & retains its shape.