لوله اسپیرال نفت

1, 2, 2.6, 2.77, 2.79, 2.81, 2.87, 3, 3.2, 3.38, 3.56, 3.68, 3.73, 3.91, 4, 4.45, 4.5, 4.78, 4.85, 5, 5.01, 5.08, 5.16, 5.49, 5.54, 6, 6.02, 6.35, 7, 7.01, 7.11, 7.62, 7.63, 7.92, 8, 8.18, 8.56, 9, 9.27, 9.58, 10, 10.31, 10.97, 11, 12, 12.7, 13, 14, 15, 15.9, 16, 17, 17.48, 18, 19, 20