... 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 ... 18*33,23*31,15*41,17*45,33.6*24,19*38,25*35,25*45,25*50, ... 3.0mm 5) Length of tube: 3000 - 8000 mm 6) Polishing: mirror/satin/brush/honed polished , 600 grit , ... 400 grit, 320grit , 240 grit, No.6 7) Term of payment : T / T ,30% in advance ...