1/2-ton though 5-ton capacities; Multiple spacer washers make bame flange wide adjustment quick and easy; Hardended 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 certifcate; Complies with OSHA ANSI/ASME B30.11 and B30.17 standards
