Greg Guarino wrote in
:

The company's site claims:

"Powerful screwed connections with 250 kg clamping force per connector
via the M5 stainless steel screw"

I am a little sceptical of that(*), but also bear in mind
that that's just a tad over 500lbs, which isn't much. You
can get 1000lbs clamping force with a regular Jorgensen bar
clamp, and several tons with a 3/4 pipe clamp.

(* that's about 1/3 the shear strength of the screw, if I'm
not mistaken, so it's in the realm of what a human with a
screwdriver could accomplish.)

John