Hex Key for Thumb Turn

A home owner from Delaware says:
What size is the hex key shown in the parts image at 82-400?

I've tried all the small metric and English hex keys I can find on the thumb turn on my Atrium lockset but cannot get it loose, so the set won't come out. Seems to be close to 1/16". Thanks.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Good morning. The hex key for the 82-400 should be 3/32".
A home owner says:
Thanks very much, Dave!
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