Polaris G-21 Ground Clamp HD 2 1/2-4 IN w/ 3/4 IN Rigid
https://nsiindustries.com/product/polaris-g-21-ground-clamp-hd-2-1-2-4-in-w-3-4-in-rigid/
Polaris grounding and bonding products provide flexible solutions for a wide range of grounding and bonding applications in the field. Uses include attaching grounding conductors to rigid conduit on different sizes of water pipe.