What size spline is 39-187?

A handy person from CT says:
What size handle fits this bore? I tried 3/8 handles and too big....
It must be either 11/32 or 7/32 right?
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Tom from SWISCO responded:
The 39-187 uses an 11/32" spline. We recommend the 39-114L handle, which you can actually see under "Related Items" on the 39-187 store page.
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