Double interlocking flexible conduits made from a helical ribbon of stainless steel AISI 304 (X5 CrNi1810 1.4301 UNI EN 10088-1) standard. They are extremely flexible and have an excellent mechanical resistance particulary when subjected to stress resulting from traction, torsion and impact. Designed particularly for use in harsh chemical environments. The coils are packed in cartons. It is necessary the use of the accessory cod. 66BOTT bushing of brass to replace the nylon bushing normally supplied on connectors.