... of API 5DP API 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 are factory specializing in the manufacture and export of drill ... the API citification in the end of the year, we are always insisting on the slogan of "Creativity, Quality First, Satisfy Clients".oil ... API spec. 5DSpecification: O.D 2 3/8, 3 1/2, 4, 4 1/2, 5, 5 1/2,6 5/8Steel Grade: E75 ...