No they do not clamp on, they have mounts like rod holders that bolt on. The mounts come with the mini-riggers.
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NRA Life member

The idea of a middle class life is slowly drifting away as each and every day we realize that our nation is becoming more of a corporatacracy.

I think name-calling is the right way to handle this one/Dan S

We're here from the WDFW and we're here to help--Uhh Ohh!