Made of heavy steel, Overhaul Balls are used on hook end of crane hoist rope to supply downhaul weight that is needed to counter bearing friction and winch-to-boom line weight. Spilt Overhaul Balls are made up of 2 cast iron halves, which clamp to line by means of bolts. Models are available in diameters of 7.12, 9.19, 9.50, and 11.25 in. or in weights of 50, 100, 89, and 154 lb, respectively.