Superstrut 1/2 in. Strut Fitting Cobra Strut Pipe Clamp CPC050-2 - The Home Depot
There was a post yesterday about "cobra clamps". These are the ones I carry. Made by "Orbit" called a "STS -075" (for 3/4" conduit). Much cheaper that than the T&B cobra clamps,
Replacement Table Clamp for Cobra and Econo Clamps – SnakeClamp Products