JET 10 Ton Capacity Industrial-Duty Plain Trolley - 252060. Designed for low maintenance and trouble-free operation through a wide range of beams. For use with wide-flange H-beams, standard I-beams or curved track. Multiple spacer washers make beam flange width adjustment 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