Mobilize hoists and get low maintenance and trouble free operation through a wide range of beams with this 1/2-PT 1/2 Ton Industrial Plain Trolley for 2-1/2" to 8" Wide Beams (252005) from Jet. For use with wide-flange H-beams, standard I-beams or curved track, the multiple spacer washers make beam flange width adjustment quick and easy. The rugged steel side plates feature built-in bumper guards and it has double sealed ball bearings.