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SpecificationProduct Name: 4 Wheel M5 Thread Trolley Assembly Color: Silver Material: Steel Strut Channel Trolley Width: 1-5/16 inch (33mm) Threaded Hole Diameter: 0.196 inch (M5) 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 : 410g AdvantageBearing welding positioning, to ensure the stability of the work.The pin shaft in the strut channel trolley bearing is made of solid stainless steel, which ensures the high strength of the Wheel trolley.Intermediate support of solid steel, high strength, impact resistance.Galvanized Zinc, rust protectionRoller Trolley Standard deep groove ball bearing installation,is very smooth no noise to it when used. Package included2pcs x 4 Wheel M5 Thread Trolley Assembly