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A quick learner from San Diego says:
These are 40 year old casement windows. The cranks are losing their finish. I would like to replace them with white cranks but cannot find any that fit. the I.D. meaures about .340 inches.
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Emily from SWISCO responded:

Hello!

Take a look at our 39-114 or the sleeker version, which would be the 39-114L. These handles fit in a spline that is 11/32" in diameter. 

SWISCO Window Operator Crank Handles
SWISCO Window Operator Crank Handles
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