Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 15 Chain and parts thereof, or iron or steel 73 15 11 Transmission type, of a pitch length of not less than 6 mm and not more than 32 mm 73 15 11 91 Transmission type, of a pitch length of not less than 6 mm and not more than 32 mm Commodity Code Description 73 15 11 91 00 Transmission type, of a pitch length of not less than 6 mm and not more than 32 mm