Advantages: - Different hole diameters can be drilled without changing the tool. - Aluminium box.Dimensions: - 4, 6, 8, 10, 12mm. - 4, 6, 8, 10, 12, 14, 16, 18, 20mm. - 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 mm.The tool is used for: - Steel sheets up to 4mm. - For aluminium sheets up to 4mm. - For cast iron sheets up to 4mm. - For plastic sheets up to 4 mm.