helically-ribbed tubes

Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape > of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes > Making tubes of special shape; Making the fittings > Making finned or ribbed tubes by fixing strip or like material to tubes > helically-ribbed tubes

Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape > of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes > Making tubes of special shape; Making fittings > Making finned or ribbed tubes by fixing strip or like material to tubes > helically-ribbed tubes