"Heavy-duty trolley is designed for superior performance and long, efficient service. Includes Standard 6-ft. hand chain drop, Capacity lbs. 3,000, Adjustable Yes, Flange Width in. Up to 8 11/16. Wrap-around side plates act as safety lugs and protect the wheels Dual-tread wheels fit both tapered and flat beam flange and include permanently lubricated shielded ball bearings Universal hanging clevis accepts most hook-mounted hoists"