This is the Quality Pole Clamp You've been looking for!
What we used to call a "Snap Lock Assembly"
The 48" Hose or Pole Clamp is a great way to attach signs to round post.
48" long, Stainless Steel Min.-Max Range - 1 7/8" to 20"
This Worm Drive Hose Clamp Works Great for
Attaching Banner Brackets to Poles and Signs to light poles.
There are many applications for these pole clamps.