1.Four-high rolling mill 2.long life 3.the best price ... Diameter (mm): 480/380/360, 380, 360, 320, 320, 320 Min. Rolling Diameter (mm): 460/360/320, 360, 340, 290, 290, 290 Rolling Diameter ... , 420 Rolling Diameter (mm): 800, 720, 630, 600, 520, 430. Four-High Rolling Mill