Hi Flame 4 Wheel Trolley Assembly, Four Bearing Trolley Assembly for Taller Strut Channel or All 1-58 Channel

4 Wheel Trolley Assembly For Use With All 1-58 Or Taller Strut Channel 916 Diameter Hole Thickness: 14 (6Mm) Silver Finish: Electro-Galvanized Zinc Design Load In 300 Lbs. At 600 Rpm, 450Lbs. At 300 Rpm, 600Lbs. At 100 Rpm Load.