Heavy Duty Spring Balancer, 44-55 lb Capacity, 6.5' Lift. B Series spring balancers are designed to increase productivity in any situation where repetitive or prompt vertical movement of fixed load is required. They compensate weight of your power tools or other manufacturing equipment and enable operator to lift or lower it with minimal effort. Experience the effect of tool float with our spring balancers. This “gravity-free” effect on all B Series models allows users to move tools with minimal effort along cable travel. Stainless steel cable and anti-friction cable guide. Gravity-free suspension capability. Ribbed and sealed monoblock construction in aluminum alloy. Safety device against load dropping due to the spring breakage (>6.5 lb)Locking device to block the load at any height. Upper rotary suspension with safety hook. Adjustable stroke limiting device