Diamond cutter for curved cutting. 4.9 inches (125 mm) (11.8 inches (300 mm) to cut); Ideal for cutting curved cuts on stone, concrete, blocks, interlocking, etc. 4.9 inches (125 mm) comes with a 0.9 inch (22 mm) to 0.8 inch (20 mm) conversion ring (made of iron). Country of Origin: China