1.Four-high rolling mill 2.long life 3.the best price 4.high quality ... Open Angle (mm): 40, 40, 20, 20, 20, 20 Operation Roll Max. Rolling Diameter (mm): 480/380/360, 380, 360, 320 ... Rolling Diameter (mm): 820, 750, 650, 600, 500, 450 Supporting Roll Max. Rolling Diameter (mm): 700, 700, 660, 520, 520, 480 ... (mm): 800, 720, 630, 600, 520, 430. Four-High Rolling Mill