“EYE-ADJUSTABLE” MANUAL TROLLEY Designed to be quickly installed on virtually any S, H, W and M type I-beams, this trolley offers easy width adjustment by rotating the center lifting eye rod clockwise or counterclockwise. The eye rod screw cannot be rotated once a hoist is attached, preventing the trolley width from accidentally being changed. Trolley is constructed using high-strength steel with a durable enamel finish.Geared Trolley features a chain gear drive for precise trolley/hoist positioning. This unit is not free-floating on the I-beam. Hanging chain length is 10 feet.