This tool includes 3 interchangeable jaws for creating circle, oval and square shapes. The circle makes 5mm, 8mm, 12mm and 15mm diameters. The oval forms 7x9mm, 8x10mm and 10x12mm. The square produces 5mm, 8mm, 11mm and 14mm sizes. With the nylon jaws, you won't have to worry about scratching or marring metal surfaces, and they can even be replaced over time. A screwdriver is included to making changing the jaws easy.