There are 1/4-20 thread inserts put into the bottom of the steel tubing. The crimp kind, see the Thread Setter on eastwoodcompany.com. The aluminum is counter bored from the bottom for SS cap head screws.
There are other ways to connect the feet. You could weld on a flange and just bolt through it into the aluminum. That is how many of the rack companies connect there feet.
Cheers
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