In article
,
says...
Channel nuts (not fishing or TV surfing related)

http://www.jdr-websites.co.uk/galler.../image/12a.jpg


Yes, you can find them at Home Depot. They are with the SuperStrut parts
stocked next to the electrical conduit. They fit the 1 5/8" wide SuperStrut.
They carry them in 1/4", 3/8" and 1/2" at least.

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DT