Photo 1 of BiJun 4 Wheel Trolley Assembly Roller, Silent Trolley Roller Steel with M12 Bolt for Use with 1-5/8" Wide and All1-5/8" Or taller Strut Channel

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Photo 1 of BiJun 4 Wheel Trolley Assembly Roller, Silent Trolley Roller Steel with M12 Bolt for Use with 1-5/8" Wide and All1-5/8" Or taller Strut ChannelPhoto 2 of BiJun 4 Wheel Trolley Assembly Roller, Silent Trolley Roller Steel with M12 Bolt for Use with 1-5/8" Wide and All1-5/8" Or taller Strut Channel