Double interlocking metal pliable conduits coated in smooth PVC. Made from a helical ribbon of Sendzimir continuous hot-dip zinc coated strip (UNI EN 10346 standard), and externally coated in smooth and self-extinguishing PVC. Resistant to most types of oils and greases, they present a good flexibility and a really good mechanical resistance when subjected to traction stresses. Black colour available on request.