Other tubes and pipes (for example, welded, riveted or similarly closed), having circular crosssections, the external diameter of which exceeds 406,4 mm, of iron or steel
Casing of a kind used in drilling for oil or gas, having circular crosssections and an external diameter of > 406,4 mm, of flatrolled products of iron or steel
Tubes and pipes having circular crosssections and an external diameter of > 406,4 mm, of flatrolled products of iron or steel, welded (excl. welded products or products of a kind used for oil or gas pipelines or of a kind used in drilling for oil or gas)