Catlog # 548 SINGLE SHEAVE AERIAL ROLLER FOR HELICOPTER PAYING OUT These rollers are used during stringing of single conductors, when paying out of pilot wire is done by helicopter. The rollers are made up of Aluminum alloy / Nylon (Depends upon requirement of Customer) & grooves are lined with neoprene rubber flap. Each roller rolls on double ball bearings. The pilot wire guide system is fitted such a way that the pilot wire falls in roller only. One side of the frames is fabricated from channel while other side is rectangle box formed from channel of alloy steel.