They're used by plumbers and electricians to secure pipes and conduit, fence companies use them to attach wire fencing to posts ... back into the caliper than a C-clamp from my woodworking tool ...

[ThingaUser] made a tool to solve a specific problem of theirs, but the design also happens to be a pretty good way to turn a c-clamp into a poor man’s light duty arbor press. The frame is made ...