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This 6-3/4 x 14-1/8 x 12-inch quick-install steel trolley lifts 4,000 lbs, engineered for safe, adaptable use on S, H, W, and M-type I-beams. Featuring a manual screw with a locking collar, it adjusts width precisely and prevents unintended changes, also locking in place when tightened. Four sealed-bearing rollers offer smooth, long-life movement, with a lifting eye for hoist attachment (hoist separate). The blue-painted steel frame ensures strength and dependability for heavier loads.