What useful thing can be make using Threaded Rod

[HandmadeCreativeChannel]

In this video I want to show you what a useful thing can be made from threaded rods.
In the video I use:
Threaded rod - M10
Bolt - M8
Washer
Nuts - M10
Bolt with nut - M2

[DIYer]

Thanks HandmadeCreativeChannel! We've added your Toggle Bolt to our Fastening category,
as well as to your builder page: HandmadeCreativeChannel's Homemade Tools. Your receipt:

Toggle Bolt by HandmadeCreativeChannel

tags: fasteners

[Carnel]

Please can you show for what application this device is useful?