Amazon.com: RHKING Electric Hoist Installation Roller Trolley 4 Wheel Trolley Assembly 2PCS Silent for use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel : Industrial & Scientific
4 Wheel Unistrut Trolley Silent Trolley Assembly Rollers,Unistrut Trolley Roller Stainless Steel with M10 Bolt and Lifting Eye Nuts for Use with ...
Wheel Trolley Fits 1-5/8" Unistrut Channel Track for Garage Attic Elevator Lift | eBay
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Heavy Duty Wheel Trolley Fit 1-5/8" UniStrut Track for Punching Bag Garage Hoist | eBay