Picote Tornado Cyclone chain (18 mm shaft) for hard deposits in cast iron pipes etc - all sizesPicote Tornado Cyclone chain (18 mm shaft) for hard deposits in cast iron pipes etc all sizes With strong hardened stainless steel links instead of carbides. These chains are long lasting and ideal for descaling and removing hard deposits inside cast iron pipes etc. The Cyclone Chains are a great option for finish cleaning because they accurately hone the pipe back to near original condition. The Cyclone Chains utilize centrifugal force to keep them