48.4-66 LB Capacity Heavy-Duty Hight Capacity Zero Gravity Balancer. Tapered drum spring balancer for production use. The tapered drum minimizes tension build-up as the cable is extended.Designed for automobile assembly, meat packing and steel manufacturing plants. Zero gravity balancers are designed to provide a consistent resistance when the operator pulls against the loaded balancer. Externally adjustable. - Cast aluminum construction - 7/32" diameter steel cable - 360° swivel hook