"The JET 2-HDT manual trolley is designed to add the mobility you need to your shop. With an ample 4400-pound capacity, this hoist comes standard with a selection of spacer washers for quick adjustments to fit beam flange widths. Hardened wheels with double sealed, permanently lubricated bearings are ideal for wide-flange H beams, standard I beams, or curved track. Compliance OSHA, ANSI/ASME B30.11 and B3017 standards. OSHA Approved Yes, Flange Width in. 3 1/4-8, Adjustable Yes, Capacity lbs. 4,400, Works With Wide-flange H beams, standard I beams, curved track. Multiple spacer washers make beam flange wide adjustment quick and easy Hardened wheels with lubricated for life, double sealed ball bearings For use with wide-flange H-beams, standard I beams or curved track Proof tested with test certificate"