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This 13-5/8 x 20-3/16 x 20-3/8-inch quick-install steel trolley handles 12,000 lbs, engineered for safe, easy use on S, H, W, and M-type I-beams. Featuring a manual screw with a locking collar, it adjusts width securely and prevents shifts, locking like a beam clamp when tightened. Four sealed-bearing rollers ensure durable, smooth movement, with a bottom lifting eye for hoist connection (hoist sold separately). The blue-painted steel frame provides exceptional strength and longevity.