This Low Profile Manual Trolley has been designed to quickly install on virtually any S and H type I-beam. The width of the trolley is adjusted by rotating the center rod with lifting eye clockwise or counterclockwise. Once hoist (not included) is attached, center rod cannot be rotated which prevents trolley width from accidentally changing. This is a push trolley. The trolley includes 4 rollers. A lifting eye is located at the bottom of the trolley for attaching a hoist (not included). Steel construction and painted finish.