Own facility:API, ISO standerd (alloy steel E.X.G.S) OD :2 3/8,2 7/8,3 1/2,4,4 1/2,5(inch) UPSET: IU,EU, IEU we have got the citification of the ISO9001 ,we will get the API citification in the end of the year, we are always insisting on the slogan of "Creativity, Quality First, Satisfy Clients".oil drill pipes:drilling pipeSpecification: O.D 2 3/8, 3 1/2, 4, 4 1/2, 5, 5 1/2,6 5/8Steel Grade: E75 ...