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SpecificationProduct Name: 4 Wheel Trolley Assembly Color: Silver Material: Steel Strut Channel Trolley Width: 1-9/32 inch (32.5mm) Steel Plate Thickness: 1/4" (6mm) Steel plate hole diameter: 9/16" (14mm)Max Load Bearing: 450pound/200kg Roller Trolley Fit For: For use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel Trolley Wheel Weight : 460g AdvantageThe bearing and pin shaft are welded to ensure the stability of the work.Trolley Roller Standard deep groove ball bearing installation,is very smooth no noise to it when used.The pin shaft in the strut channel trolley bearing is made of solid Bearing steel, which ensures the high strength of the Wheel trolley.Steel Plate of solid steel, high strength, impact resistance.Galvanized Zinc, rust protectioninstallation note: If the height of the strut channel used with the Trolley Assembly is not enough, the trolley roller will encounter the mounting bolts inside the guide rail. The strut channel is recommended to be used horizontally. Package included1pcs x 4 Wheel Trolley Assembly