Welded steel frame with a series of sheaves to form a large radius | Cast steel closure-type hooks with a 1-Inch (25.4 mm) opening | 5-Inch (127 mm) wide aluminum alloy sheaves | Use with any cable puller whose maximum pulling force is 4000-Pound or lessGreenlee's 4000-Pound capacity conveyor sheaves have a 5-Inch (127 mm) wide aluminum alloy sheave. Strong, welded steel frames. Yokes with forged steel closure-type hooks with 1-Inch (25.4 mm) opening. Select a sheave with a maximum rated capacity that meets or exceeds the cable puller's maximum pulling force.