Made of lightweight non-magnetic material, possibly aluminium. Threads are cut to 1/4-20 on one end and 3/8-16 on the other end. The narrow part of the barrel is 7/16" (11mm) and the wide part is 5/8" (16mm). The grooved portion is 3/4 inch (19mm). I use these with the SmallRig Super Clamps and they allow the clamp to fit the PanaVise 350. The adapters fit standard light stand sockets.
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