Spiral tension rod

A handy person from Pittsburgh Pennsylvania says:
Five eights or 9/16 x 34" no identifying red or white or blue markings
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Casey from SWISCO responded:

Hello,

If this balance came from a tilt window, see our S600-34. For a non-tilt window, see the S500-34. In either case, I'd recommend weighing your window sash and following the chart under the balance product description to choose the correct color option. Thank you!

How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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