knobs needed

A quick learner says:
The hole opening is 3/8
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Casey from SWISCO responded:

Hello,

We carry the 39-104 handle with a 3/8" diameter operator spline opening but 11/32" is a more common size, which would be the 39-114. Take a look and if you're having trouble determining the correct size, feel free to get back to us with photos of your original operator with the window open so that the arms that move the sash are fully visible. If we can identify your operator, that would help us confirm the handle size that you would need. Thank you! 

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