That's a Manfrotto Super Clamp (a very common clamp, also referred to as a Mafer clamp or a master clamp). New, they cost about $25 each. I have nine of these and there are actually six being used in the image above:
The super clamp is attached to an umbrella adapter via a male-male pin. These are plastic and really aren't made to be used like this, but the foam core is so light that it's ok. They go for about $20-30 and I have two of these:
The super clamp is attached to an umbrella adapter via a male-male pin. These are plastic and really aren't made to be used like this, but the foam core is so light that it's ok. They go for about $20-30 and I have two of these:
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