1) Material: stainless steel ASTM 304, 304L, 316L. 2) Application: Biochemistry, Pharmaceutical, Food.... 3) Machine polished according to your request: ID/OD Polished to 180 Grit (Ra<= 0.8um) to 420 Grit (Ra<= 0.4um). Sanitary pipes (Hydraulic tube, Stainless steel pipe welded stainless steel pipe , seamless stainless steel pipe.)