Maintain precise edges on your instruments with the Hu-Friedy Arkansas sharpening stone. This hard, super-fine grit, conical stone is designed for sharpening the facial surface of curettes. Use with oil for smooth, controlled honing and a refined finish. Compact and durable, it measures 3 1/2" x 5/16" base (8.9 x 0.8 cm) for easy handling and storage.