Spiral tilt window balance

A quick learner from Sevierville tn says:
Is this a S600 -24 . I think it is 3/8

Thanks Tony
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Bob from SWISCO responded:

Thanks for posting. It is always a bit tough to tell from pictures of measuring tape. However, if the outer tube is less than 1/2" in diameter, then its safe to say its 3/8". If so, then you actually need the S900-24, with a red tip option. Let me know if you have further questions. 

A quick learner from Sevierville tn says:
Ok thank you
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Bob from SWISCO responded:

You're welcome. Let us know if you have further questions, and many thanks for reaching out. 

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