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- #401
This is a 3/8" unistrut/superstrut conical nut. It's standard vs metric, but Rhino-Rack uses basically identical hardware in their products (albeit metric...M8x1.25), e.g. here's their Rotopax "fit kit" but the same oblong camming nut is used to construct the Pioneer platform, see 1:04 (among other things).