... ,smooth surface 3,uniform wall thickness Precise seamless steel pipe We can supply tubing & casing manufactured according to API ... Specification 5CT with the following speciication: Manufacturing Method precise seamless steel ... ”,13-3/8”,16”,18-5/8”,20” Tubing:2-3/8”,2-7/8”,3-1/2 ... about us please visit: www.cfbpco.com precise seamless steel pipe