Material:TP304 TP304L TP316 TP316L TP321 904L(NO8904) TP310S(S31008) SS31803 SS32570 S34700 S31703. OD:6mm ~ 720mm. Thickness:0.89mm ~ 40mm. Length:1m ~ 15m. Surface:primary colour,polished inside or ourside or both. Applications: used in the petroleum, smelting, foodstuff, power, paper making, chemical, medical eqiupment, aviation,boiler heat~exchanger and other fields