... a) Round tube and embossed tube : O. D. mm9.5 , 12.7 , 15.9 , 17 , 18 , 19. 1 , ... 20*20 , 22* 22 , 23* 11 , 23 *23 , 24* 12 , 24*24 , 25*13 , 25*25 , 28*28 , 30*15 , 30* ... mm)8*5,10*20,10*24,11*24.5,13*22,12*23,12*24,15*25,15*30,10*33, ... 15*35,18*33,23*31,15*41,17*45,33.6*24 ... 50 people d) Factory Size : 46,000 square meters)12) Trade & Marketa) North America b) South America c ...