NEWHOUSE ELECTRIC 1-5/8 in. Trade Size Heavy-Duty Steel 4-Wheel Trolley Assembly with Sealed Bearings for 1-5/8 in. Strut Channel HT4W-158S - The Home Depot
Mounting Options for UNISTRUT Trolley Assemblies - YouTube
Electric 4 Wheel Trolley Assembly for Taller Strut Channel for 1-5/8" Wide All Unistrut 1-5/8" 4 Wheel T Trolley Assembly Roller Stable Trolley Silent ...