1,precise seamless steel pipe 2,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 pipe casing&tubingSize (OD)Casing:4-1/2”,5”,5-1/2”,6-5/8”,7”,7-5/8”8-5/8”,9-5/8”,10-3/4”,11-3/4”,13-3/8”,16”,18-5/8”,20” Tubing:2-3/8”,2-7/8”,3- ...