JET Ball-Bearing Trolleys - 4000-Lb. Capacity
For use with wide-flange H-beams, standard I-beams, or curved track. Multiple spacer washers make adjustment of beam flange width quick and easy. Rugged steel side plates feature built-in bumper guards. Hardened wheels with lubricated for life, double sealed ball bearings . Proof tested with test certificate. Complies with OSHA, ANSI/ASME B30.11 and B30.17 standards
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