insert connector hex size

A quick learner from Pullman says:
Insert connector product code 39-339 I need to know what dimension is the hex
end. I need 1/4" the length works I just need to make sure the hex end is the
right diameter.
Dan
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Tom from SWISCO responded:

Thanks for reaching out to us. The size of the hex end of the 39-339 is 5/16".  I hope this information helps you.

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