NEWHOUSE ELECTRIC 1-5/8 in. Trade Size Steel Electric Hoist Mount 4-Wheel Trolley Assembly with Sealed Bearings for 1-5/8 in Strut Channel EL4W-158H - The Home Depot
Phenomenal overhead trolley system On Offer - Alibaba.com
Jervis Webb I-beam trolley systems from Ultimation - YouTube
Amazon.com: Newhouse Electric Wheel Light Duty Trolley Assembly for use with All 1-5/8" or Taller Strut Channel, Unistrut, Superstrut : Industrial & Scientific