Casing and tubing of a kind used in drilling for oil or gas
Casing and tubing of a kind used in drilling for oil or gas, welded, of flatrolled products of iron or steel, of an external diameter of < 406,4 mm (excl. products of stainless steel or of cast iron)
Casing and tubing of a kind used in drilling for oil or gas, welded, of flatrolled products of stainless steel, of an external diameter of < 406,4 mm